A certain first order reaction has a half-life of 54. 3 s. How long will it take (in s) for the reactant concentration to decrease from 6. 50 m to 2. 27 m?

Answers

Answer 1

Answer:

82.4 s

Explanation:

Find the NUMBEr of half lives...then multiply by 54.3

2.27 = 6.5 (1/2)^n

log (2.27/6.5) / log (1/2) = n = 1.52 half lives

1.52 * 54.3 = 82.4 s


Related Questions

Which main intermolecular force must be overcome to convert liquid nh3 to nh3 vapor?

Answers

Intermolecular hydrogen force must be overcome to convert liquid NH3 to NH3 vapour.

Sublimation is the phase transition of a substance directly from the solid to the gaseous phase without passing through the liquid phase.

There are the 3 forces that exist between the 2 molecules of NH3

1. Dispersion force: these forces exist between any 2 molecules regardless of anything else.

2. Hydrogen bonding: H is directly bonded to the extremely electronegative atom N, O and F, hence is nearly stripped off electron due to the large electronegativity difference. Hydrogen being small atom further reduces in size even allowing it to approach other molecules very closely. Here, N, O, and F gathers more partial negative charge.

Due to the closure approach between the molecule and strong partial charge, hydrogen bonding is generally more important than dipole bond.

3. dipole dipole interaction: NH3 is a polar molecule with a permanent separation of charge. Each molecules behaves like a tiny magnet and has positive and negative poles so 2 NH3 molecules attract each other. Dipole dipole interactions are stronger than dispersion force in the small molecules.

Thus we concluded that the hydrogen bond should overcome to convert NH3 to vapours.

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A vessel with a volume of 32. 5 l contains 2. 80 g of n2 gas, 0. 403 g of h2 gas, and 79. 9 g of ar gas. at 25°c, what is the total pressure in the vessel? show the set up and answer with unit

Answers

The total pressure of the gases in the vessel is found out by using the partial pressures of individual gases and adding them up. The total pressure of the gases in the vessel is 1.72 atm.

The Partial pressure of the gases is the individual pressure of the gases present in a vessel containing a mixture of gases. The total pressure can be found out by adding partial pressure of all gases.

Given:

Volume of vessel, V= 32.5L

Mass of Nitrogen gas = 2.8g

Mass of Hydrogen gas = 0.403g

Mass of Argon gas = 79.9g

We know that:

             Molar Mass of Nitrogen gas = 28g

             Molar Mass of Hydrogen gas = 2g

             Molar Mass of Argon gas = 40g

∴ Moles of gas = Given mass / Molar mass

∴ Using the Ideal Gas Equation:

PV = nRT

where, P is the Pressure of gas

V is the volume of gas

n is the moles of gas

R is the Universal Gas constant

T is the temperature

Applying the above equation of all three gases indivudually,

∴ For Nitrogen,

P₁V = n₁RT                    

⇒ P₁ × 32.5 = 2.8/28 × 0.082 × 298

⇒ P₁ = 0.07atm

∴ For Hydrogen,

P₂V = n₂RT                    

⇒ P₂ × 32.5 = 0.4/2 × 0.082 × 298

⇒ P₂ = 0.15 atm

∴ For Argon,

P₃V = n₃RT                    

⇒ P₃ × 32.5 = 79.9/40 × 0.082 × 298

⇒ P₃ = 1.5 atm

∴ Total pressure of vessel, P = P₁ + P₂ + P₃

                                         P = 1.72 atm

The total pressure of the gases in the vessel is 1.72 atm.

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Which acid or base (along with its corresponding salt) should be used to generate a buffer solution with ph around 3. 5?

Answers

Formic acid, Sodium formiate will generate a buffer solution with pH around 3. 5.

It must consider the acid whose pKa = pH in order to choose the base or acid that can produce a buffer solution with such a pH of about 3.5.

However, it also need to consider buffer capacity, which is a factor that can alter the pH of a solution by one unit in a liter.

The connection between the components' concentrations and their concentrations themselves affects buffer capacity in addition to their individual concentrations.

Therefore, Formic acid, Sodium formiate will generate a buffer solution with pH around 3. 5.

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How many milliliters of 10. 5 m hcl(aq) are needed to prepare 225. 0 ml of 1. 00 m hcl(aq)?

Answers

There are  21.42 milliliters of a 10. 5 M HCl(aq) are needed to prepare 225. 0 ml of 1. 00  M HCl(aq)

Calculation,

The formula for the dilution of a solution is given as:

[tex]M_{1} V_{1} =M_{2} V_{2}[/tex]

Where M is molarity and V is the volume of the solution in liters ( L ).

Given data,

[tex]M_{1}[/tex] =   10. 5 M

[tex]V_{1}[/tex] = ?

[tex]M_{2}[/tex] = 1. 00 M

[tex]V_{2}[/tex] = 225. 0 ml

10. 5 M × [tex]V_{1}[/tex] = 1. 00 M×225. 0 ml  

[tex]V_{1}[/tex]  in milliliters = 1. 00 M×225. 0 ml / 10. 5 M = 21.42 ml

Volume in milliliters is  21.42 ml .

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How many grams of nitrogen gas are formed when 18. 1 g of ammonia is reacted with 90. 4 g of copper(ii) oxide?

Answers

10.55 grams of nitrogen gas are formed when 18. 1 g of ammonia is reacted with 90. 4 g of copper(ii) oxide.

What is stoichiometric law?

The laws which deals with the composition of substance by mass or his volume are called the laws of stoichiometry.

The laws of stoichiometry are:

  Law of conservation of mass   Law of definite/constant proportion   Law of multiple proportion   Law of reciprocal proportions   Law of gaseous volume

Reaction:

3CuO + 2NH₃ → N₂ + 3 Cu + 3 H₂O

n(CuO) = m(CuO) / 64 + 16 = 90.4 / 80 = 1.13 mol   (molar mass of CuO = 90.4)

n(NH₃) = m(NH₃) / 14+3 = 18.1 / 17= 1.065mol   (molar mass of NH₃ = 18)

For 1.065 mol of NH3 undergoing the reaction, 3/2  times larger amount of CuO is needed.

CuO is 1.6 mol but it's only 1.13 of it so CuO is a limiting reactant, we must count stoichiometry by amount of this reactant.

n(CuO) = 1.13 mol,

n(N₂) = n(CuO) / 3 = 1.13 / 3 = 0.376 mol

m(N₂) = 0.376 x 28 = 10.55 grams

10.55 grams of nitrogen gas are formed when 18. 1 g of ammonia is reacted with 90. 4 g of copper(ii) oxide.

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If 36. 0 ml of 0. 20 m hcl is added to 30. 0 ml of 0. 40 m naoh, what will be the ph of the resulting solution?

Answers

The pH of the resulting solution is 2.05

Sodium hydroxide and hydrochloric acid neutralize each other in a 1:1 mole ratio as described by the balanced chemical equation

           [tex]NaOH_{(aq)} + HCL_{(aq)}[/tex] →  [tex]NaCl_{(aq)} + H_2O_{(aq)}[/tex]

This means that a complete neutralization, which would result in a neutral solution, i.e. a solution that has pH=7 at room temperature, requires equal numbers of moles of sodium hydroxide and hydrochloric acid.

Notice that your two solutions have equal molarities, but that the volume of the hydrochloric acid solution is 1.2 times larger than the volume of the sodium hydroxide solution. This implies that the number of moles of hydrochloric acid is 1.2 times bigger than the number of moles of sodium hydroxide.

This means that after the reaction is complete, you will be left with excess hydrochloric acid → the pH of the resulting solution will be <7.

Now, the number of moles of hydrochloric acid that will not take part in the reaction is given by

= moles of HCL added - moles of NaOH added

= 36 × [tex]\frac{0.100 moles HCL}{10^3 ml}[/tex] - 30 × [tex]\frac{0.100 moles HCL}{10^3 ml}[/tex]

= [tex]\frac{6* 0.100 moles}{10^3}[/tex]

The total volume of the resulting solution will be = ( 30 + 36 ) mL

                                                                            = 66 mL

Since hydrochloric acid is a strong acid that ionizes in a 1:1 mole ratio to produce hydronium cations, you can say that the concentration of hydronium cations in the resulting solution will be

[tex][ H_3O^+] = \frac{\frac{6*0.100}{10^3} }{66*10^3}[/tex]

[tex][ H_3O^+] = \frac{6*0.100}{66}[/tex]

pH = - log [tex](\frac{6*0.100}{66} )[/tex]

pH =  2.05

Therefore, the pH of the resulting solution is 2.05.

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You are working in a lab on your magnetic levitation experiment. you are standing directly in front of two magnets. another scientist near you has a malfunction with their equipment and beta radiation is emitted directly at you, passing through the magnets first. you are wearing a lab coat and goggles. are you safe?

Answers

Yes, because magnets strongly deflect beta radiation, you wouldn't have been affected.

What should a lab do and not do?

Guidelines for conduct in the science lab

Never consume food or beverages in a science lab.Avoid attempting to be a mad scientist.Avoid going into the lab without an adult present.Do put on appropriate clothing.Clean up the workspace and dispose of the trash.Do keep in mind where the emergency supplies are kept.Which method ensures lab safety?Avoid coming into contact with chemicals directly. Never taste, smell, or inhale lab chemicals. After taking off your gloves and before leaving the work area, wash your hands and arms thoroughly with soap and water. In a lab, never consume food or liquids, chew gum or tobacco, light up, or use cosmetics.

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Select the correct answer.
Two charged objects, A and B, are exerting an electric force on each other. What will happen if the charge on A is increased?
A. The charge on B will decrease.
B. The charge on B will increase.
C. The electric force between A and B will decrease.
D. The electric force between A and B will increase.

Answers

According to Coulomb's law of  electrostatic forces, as the charge of a body  increases, the force exerted also increases. Hence, The electric force between A and  B increases as the charge of A increases.

What is Coulomb's law ?

Coulomb's law states that, the electrostatic force between two charges is directly proportional to the magnitude of their charges and inversely proportional to the distance between them.

The mathematical expression for Coulomb's law is written as follows:

F = k q1 q2/r²

where, q1 and q2 be the charges r be the distance between them, k is the proportionality constant.

Therefore, as the charge of A increases, irrespective whether the force is attractive or repelling, the electric force between them A and B increases.

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if there are 12 moles of hydrogen how many moles of nitrogen are needed to react completely with the hydrogen? (N2(g)+3H2(g)->2NH3(g))

Answers

Answer:

Explanation:

Take a look at the balanced chemical equation for this synthesis reaction

N

2(g]

+

3

H

2(g]

2

NH

3(g]

Notice that you have a

1

:

3

mole ratio between nitrogen gas and hydrogen gas. This means that, regardless of how many moles of nitrogen gas you have, the reaction will always consume twice as many moles of hydrogen gas.

So, if you have

2

moles of nitrogen taking part in the reaction, you will need

2

moles N

2

3

moles H

2

1

mole N

2

=

6 moles H

2

A student weighs out 0. 0422 g of magnesium metal. The magnesium metal is reacted with excess hydrochloric acid to produce hydrogen gas. A sample of hydrogen gas is collected over water in a eudiometer at 32. 0°c. The volume of collected gas is 43. 9 ml and the atmospheric pressure is 832 mmhg. Using the experimentally collected data, calculate r and the percent error.

Answers

The value of r is 0.0868 and the error percentage is 5.78%.

The student weights 0.0422 grams of magnesium; thus, we may deduce that the magnesium he used is the mass of the magnesium over the additional mass, which is 0.024422.That is roughly equal to 0.001758.It also asserts that too much hydrochloric acid can react with magnesium, releasing hydrogen gas as a result.A sample of hydrogen gas is collected over water in a meter at a volume of 43.9 cc and a maximum pressure of 22 cc.

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A 0.200 M solution of a weak acid, HA, is 9.4% ionized. Using this information, calculate Ka for HA.

Select one:

a.
9.4 × 10−3


b.
1.8 × 10−3


c.
1.9 × 10−2


d.
3.8 × 10−3

Answers

[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]

Let's solve ~

Initial concentration of weak acid HA = 0.200 M

and dissociation constant ([tex]{ \alpha} [/tex]) is :

[tex]\qquad \sf  \dashrightarrow \: \alpha = \frac{dissociation \: \: percentage}{100} [/tex]

[tex]\qquad \sf  \dashrightarrow \: \alpha = \frac{9.4}{100} = 0.094[/tex]

Now, at initial stage :

[tex] \textsf{ Conc of HA = 0.200 M} [/tex]

[tex] \textsf{Conc of H+ = 0 M} [/tex]

[tex] \textsf{Conc of A - = 0 M} [/tex]

At equilibrium :

[tex] \textsf{Conc of HA = 0.200 - 0.094(0.200) = 0.200(1 - 0.094) = 0.200(0.906) = 0.1812 M} [/tex]

[tex] \textsf{Conc of H+ = 0.094(0.200) = 0.0188 M} [/tex]

[tex] \textsf{Conc of A - = 0.094(0.200) = 0.0188 M} [/tex]

Now, we know :

[tex]\qquad \sf  \dashrightarrow \: { K_a = \dfrac{[H+] [A-]}{[HA]}} [/tex]

( big brackets represents concentration )

[tex]\qquad \sf  \dashrightarrow \: { K_a = \dfrac{0.0188×0.0188}{0.1812}} [/tex]

[tex]\qquad \sf  \dashrightarrow \: { K_a = \dfrac{0.00035344}{0.1812}} [/tex]

[tex]\qquad \sf  \dashrightarrow \: { K_a \approx 0.00195 } [/tex]

[tex]\qquad \sf  \dashrightarrow \: {K_a \approx 1.9 × {10}^{-3} } [/tex]

According to the problem, we have a 0.200 M solution of a weak acid HA that is 9.4% ionized. To find the Ka (acid dissociation constant) for HA, we can use the percent ionization formula:

[tex]\sf \% \: ionization = \dfrac{[H+]}{[HA]initial \times 100}[/tex]

From this formula, we know that [H+] (the concentration of hydrogen ions) is equal to 9.4% of [HA]initial, and [HA]initial is equal to the initial concentration of the weak acid, which is 0.200 M. Solving for [H+], we get:

[tex]\sf [H+] = 0.094 \times 0.200 \: M = 0.0188\: M[/tex]

Now we can use the equation for Ka:

[tex]\sf Ka = \dfrac{[H+][A-]}{[HA]}[/tex]

We don't know the concentration of the conjugate base (A-) at this point, but we can assume that it is equal to [H+] because the weak acid is only slightly ionized. Therefore, we can substitute [A-] = [H+] = 0.0188 M into the equation and solve for Ka:

[tex]\sf Ka = \dfrac{(0.0188)^2}{(0.200 - 0.0188)} = \bold{1.8 \times 10^{-3}}[/tex]

So the answer is [tex]\bold{ B.\: 1.8 \times 10^{-3}}[/tex].

I hope this helps!

Which of these atoms is the most electronegative?
a. si
b. cl
c. p
d. f
e. c

Answers

The Chlorine and fluorine atoms are  the most electronegative.

So, option D and E is correct one.

The atom of a given chemical elements having tendency to attract bonded pair of electron toward itself is called electronegativity. The electronegativity of atoms is affected by both its atomic number and distance at which its valence electrons resides from the charged nucleus.

The electronegativity of the elements is increases on moving left to right in the period of periodic table while decreasing on moving top to bottom in the group of periodic table .

Example:

The elctronegativity of fluorine atom = 3.98

The elctronegativity of chlorine atom =3.16

The elctronegativity of carbon atom = 2.25

The elctronegativity of phosphorus atom = 2.19

The elctronegativity of silicon atom = 2.58

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How many grams of water are made from the reaction of 16.0 grams of o2? given the reaction: 2h2 o2 --> 2h2o

Answers

Answer:

18.0 g H₂O

Explanation:

To find the mass of water (H₂O), you need to (1) convert grams O₂ to moles O₂ (via the molar mass), then (2) convert moles O₂ to moles H₂O (via mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂O to grams H₂O (via the molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.

Molar Mass (O₂): 2(15.998 g/mol)

Molar Mass (O₂): 31.996 g/mol

Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol

Molar Mass (H₂O): 18.014 g/mol

2 H₂ + 1 O₂ -----> 2 H₂O

16.0 g O₂          1 mole            2 moles H₂O         18.014 g
---------------  x  ----------------  x  ---------------------  x  -----------------  = 18.0 g H₂O
                        31.996 g             1 mole O₂             1 mole

Write 3–4 sentences to describe how coupling reactions are used to drive an unfavorable chemical reaction.

Answers

The concept of coupling reactions can be more understood knowing that Gibbs free energy is a state function. State function is a property that does not depend on the path taken to arrive to that value

What is Coupling reaction ?

A reaction where the the free energy of a thermodynamically favorable transformation, such as the hydrolysis of ATP, and a thermodynamically unfavorable one, are mechanistically joined into a new reaction (or may be envisaged to be so joined) is known as a coupled reaction.

How do you make an unfavorable reaction favorable?

Chemically unfavorable means non-spontaneous which means Gibbs' free energy change (ΔG) is positive, i.e. ΔG>0.

But we know that ΔG=ΔH−TΔS. Now ΔH and ΔS (enthalpy and entropy change, respectively) are state functions. So ΔG is also a state function.

Catalysts can only change the pathway of a reaction (in most of the cases, by lowering the activation energy of the reaction (Ea)) but after using the catalysts also, the energy states of the reactants and products don't alter. So ΔH and ΔS remain the same as uncatalysed reaction. So ΔG also doesn't change at all. So if the reaction is non-spontaneous, it remains like that.

That means, the thermodynamically unfavorable reaction can't be made favorable by introducing a catalyst.

But changing the temperature to a very high value can make ΔG<0, so the reaction can be made favorable by abruptly increasing temperature.

What are favorable and unfavorable reactions?

Reactions that release energy are energetically favorable. Conversely, reactions in which the products are higher in energy than the reactants require an input of energy to proceed; such reactions are energetically unfavorable

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A solution is made by dissolving 42.3g of potassium hydroxide in 329g of water what is the molality of the solution?

Answers

Answer:

2.34 molality

Explanation:

Mole weight of KOH ( using periodic table ...rounded to 3 s.f.) =

              56.1 gm/mole

Number of moles in 43.2 g

  43.2 g  /  56.1 gm / mole =.770 mole

molality = .770 mole / .329 kg = 2.34 m

Could someone explain this sentence for me ?​

Answers

Answer:

Explanation:

to put this plainly after putting strong electrolytes in water they dissolve to nothing but ions they give you an example and definition of a strong electrolyte I suggest you read those and see if you come up with what I gave you they also tell you that not all strong electrolytes dissolve as strongly as others that are in the example.

The angle between the hydrogen atoms in water (h2o) is slightly less than expected for a tetrahedral shape. this is because of the:_______.

Answers

The angle between the hydrogen atoms in water (h2o) is slightly less than expected for a tetrahedral shape. this is because of the extra electron repulsion from the lone pairs.

A water molecule consists of two hydrogen atoms and one oxygen atom. The three atoms make an angle; the H-O-H angle is approximately 104.5 degrees. The centre of each hydrogen atom is approximately 0.0957 nm from the centre of the oxygen atom.

In water, each hydrogen nucleus is covalently bound to the central oxygen atom by a pair of electrons that are shared between them. In H2O, only two of the six outer-shell electrons of oxygen are used for this purpose, leaving four electrons which are organized into two non-bonding pairs. The four electron pairs surrounding the oxygen tend to arrange themselves as far from each other as possible in order to minimize repulsions between these clouds of negative charge. This would ordinarily result in a tetrahedral geometry in which the angle between electron pairs (and therefore the H-O-H bond angle) is 109.5°. However, because the two non-bonding pairs remain closer to the oxygen atom, these exert a stronger repulsion against the two covalent bonding pairs, effectively pushing the two hydrogen atoms closer together. The result is a distorted tetrahedral arrangement in which the H—O—H angle is 104.5°.

About tetrahedral shape :

In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the ordinary convex polyhedra and the only one that has fewer than 5 faces.

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An aerosol mixture of particulates and sulfur compounds form a grayish colored substance that is called ________. inversion smog industrial smog photochemical fog sulfuric aerosols industrial fog

Answers

An aerosol mixture of particulates and sulfur compounds form a grayish-colored substance that is called industrial smog.

What is Particulate Matter?

Airborne particulate matter (PM) is a composite of several chemical species rather than a single contaminant. It consists of a complex mixture of solids and aerosols, including dry solid particles, liquid-coated solid cores, and minute liquid droplets. Particles can contain inorganic ions, metallic compounds, elemental carbon, organic compounds, and chemicals from the earth's crust. They can vary greatly in size, shape, and chemical makeup. For the goal of regulating air quality, the particle diameter is used.

Those that have a diameter of 10 microns or below (PM10) are inhalable and can have a negative impact on health. Particles with a diameter of 2.5 microns or less are considered to be fine particulate matter (PM2.5). Consequently, a percentage of PM10 is made up of PM2.5.

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What process is used to determine if an acid-alkali neutralization is complete? a. titration b. bronsted-lowry neutralization c. arrhenius neutralization d. filtration

Answers

Answer : a. Titration

Explanation: Titration is a common laboratory method of quantitative chemical analysis to determine the concentration of an identified analyte. A reagent, termed the titrant or titrator, is prepared as a standard solution of known concentration and volume.

What types of elements have atomic radii which remain relatively constant across a period? group of answer choices transition metal elements nonmetal

Answers

"Transition metal elements" are the type of element which have atomic radii which remain relatively constant across a period.

Periods refer to the horizontal lines of the periodic table. Each period represents the sequential occupation of an atom's valence shell orbitals, also with longer periods representing the employment of an atom's d subshell orbitals.

As the atomic number rises, more electrons, as well as protons,  are present, increasing attraction over time, which drives the atomic radius to shrink over time.

Therefore, "Transition metal elements" are the type of element which have atomic radii which remain relatively constant across a period.

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This formula equation is unbalanced. pb(no3)2(aq) li2so4(aq) right arrow. pbso4(s) lino3(aq) which coefficient should appear in front of lino3 in the balanced equation?

Answers

The coefficient 2 should appear in front of [tex]LiNO_{3}[/tex] in the balanced equation

   

The chemical equation in which number of atoms in reactant side is equal to the number of atom in product side is called balanced chemical equation. The example of balanced equation is given as,

[tex]Pb(NO_{3} )_{2} (aq) + Li_{2} SO_{4} (aq)[/tex] →  [tex]2Li(NO_{3} ) (aq) + Pb SO_{4} (aq)[/tex]

In the above equation, 2 is appear in front of [tex]LiNO_{3}[/tex] in the balanced equation which is known as the coefficient.

The symbolic representation of the chemical reaction is called chemical equation.

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Answer: 2

Explanation:

Olive oil and butter both contain fats; however, olive oil is liquid at room temperature and butter is solid. Why?.

Answers

Double bonds found in unsaturated fats form structures that stop tightly bound formations.

The arrangement of the phospholipids in the bilayer cell membrane depends on features of the phospholipid head and tails.

What are saturated and unsaturated fatty acids ?

Unsaturated fatty acids have at least one double bond in the fatty acid chain while saturated fatty acids have no double bonds between the individual carbon atoms. Unsaturated fats are typically liquid and come from plant sources, whereas saturated fats are typically solid at room temperature

Animal fats, palm oil, and other sources of saturated fats are available. Plant and vegetable oils are sources of unsaturated fatty acids,Consuming healthy fats instead of saturated fat can also aid in preventing insulin resistance, a condition that precedes diabetes. Since unsaturated fat continues to be the healthiest type of fat, saturated fat may not be as bad as previously believed

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In a titration experiment, 31. 4 ml of 1. 120 m hcooh is neutralized by 16. 3 ml of ba(oh)2. what is the concentration of the ba(oh)2 solution?

Answers

In a titration experiment, 31. 4 ml of 1. 120 M HCOOH is neutralized by 16. 3 ml of [tex]Ba(OH)_{2}[/tex]. So, the concentration of the [tex]Ba(OH)_{2}[/tex]  solution is 23.16 M

Calculation,

The formula for the dilution of a solution is given as:

[tex]M_{1} V_{1}[/tex] = [tex]M_{2} V_{2}[/tex]

Where M is molarity and V is the volume of the solution in liters ( L ).

Given data,

[tex]M_{1}[/tex] =  120  M

[tex]V_{1}[/tex] =31. 4 ml

[tex]M_{2}[/tex] = ?

[tex]V_{2}[/tex] = 16. 3 ml

120  M ×31. 4 ml  =  [tex]M_{2}[/tex]  ×  16. 3 ml

[tex]M_{2}[/tex]  = 120  M ×31. 4 ml / 16. 3 ml =23.16 M

In a titration experiment, the concentration of the [tex]Ba(OH)_{2}[/tex]  solution is 23.16 M

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What volume (to the nearest 0. 1 ml) of 4. 70-m naoh must be added to 0. 700 l of 0. 250-m hno2 to prepare a ph = 3. 20 buffer?

Answers

log1.429V=3.20  volume (to the nearest 0. 1 ml) of 4. 70-m NaOH must be added to 0. 700 l of 0. 250-m HNO2 to prepare a ph = 3. 20 buffer

Solution ;

pH= pKa +log {[ NaOH ] / [ HNO2 ]​}

3.20=3.80+log{(V×4.70)/ ( 0.700×0.250)}

3.20=log1.429V

Volume will be 3.20=log1.429V

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If the concentration of a dilute solution of nitric acid is 0. 0001 m. What is the ph of that solution?

Answers

If the concentration of a dilute solution of nitric acid is 0. 0001 M. The pH of the solution is 4.

What is pH ?

pH is used to measure whether the substance is acidic, basic or neutral and the range is 0 - 14.

How to find the pH of the solution ?

To calculate the pH hydrogen ion it is expressed as:

pH = - log [H⁺]

So, concentration of hydrogen ion in HNO₃ is 0.0001 M.

pH = - log [0.0001]

     = [tex]-\log (\frac{1}{10000})[/tex]

     = - log (10)⁻⁴

     = -4 × - log (10)

     = - 4 × (-1)

     = 4

Thus from the above conclusion we can say that The pH of the solution is 4.

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How does the body structure of each of these organisms contribute to a particular function?

Answers

Define

body structure: the shape of specific organs/attributes of an organism. This includes cells, tissues, organs, and systems.

function: the action or purpose an organ or attribute has.

Examples

Body structure

Function

Teeth allow organisms to chew food so that it is easier to digest and/or rip food.Certain skin patterns/colors may help an organism camouflage in its surrounding enviornment

Can't Touch ThisSpiny Katydid

What is a body structure of the Spiny Katydid?

Spines on the body

What is the function of this structure?

The spines on the Spiny Katydid's body prevent predators from having an easy time eating them

Further Notes:

Without the spines on their body, Spiny katydids would be more vulnerable to being eaten. The spines help them survive

Blow on Your FoodLonghorn Cowfish

What is a body structure of the Longhorn Cowfish?

puckered mouth

What is the function of this structure?

The puckered mouth allows the Longhorn Cowfish to blow jets of water.

Further Notes:

The jets of water the Longhorn Cowfish blows move the sand, exposing the organisms it eats. Without the puckered mouth, the Longhorn Cowfish would have difficulty finding food.

Night VisionTarsier

What is the body structure of the Tarsier?

Huge eyes

What is the function of this structure?

The Tarsier's huge eyes allow it to see well.

Further Notes:

It's excellent vision helps it see and hunt for prey

Key Terms

body structure

function

While working in a pharmaceutical laboratory, you need to prepare 1.50 L of a 2.20-M NaCl solution. What mass of NaCl would be required to prepare this solution

Answers

193 grams of NaCl are needed to make 1.50 L of a 2.20-M NaCl solution.

Calculation of the mass of NaCl required:

The only thing we need to know is that a solution's molarity informs us of the exact amount of moles of solute that are contained in 1 L of a solution.

In this situation, a NaCl (sodium chloride) solution with a 2.20-M concentration will have 2.20 moles of the solute (sodium chloride) in every 1 L of the solution.

The solution's molarity of 2.20 M requires that every 1 L of this solution include 2.20 moles of sodium chloride, which implies that every 1.50 L of this solution needs to contain

[tex]1.5 L solution .\frac{2.20 moles NaCl}{1L solution} = 3.30 moles NaCl[/tex]

Utilize the compound's molar mass to translate the amount of NaCl (sodium chloride) in moles to grams.

[tex]3.30 moles NaCl . \frac{58.4 gm}{1 mole NaCl} = 192.7 gm[/tex] ≈ 193 gm

Therefore it is concluded that the final answer is 193 gm.

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How many moles of electrons are required to produce 99. 9 g of aluminum metal from a sample of molten aluminum fluoride?

Answers

299.7 moles of electrons are required to produce 99. 9 g of aluminum metal from a sample of molten aluminum fluoride.

Calculation,

The production of aluminium metal is given as,

[tex]Al^{+3} + 3e^{-}[/tex]→ [tex]Al[/tex]

The 3 moles of electrons require to produce 1 gm of atom of aluminium ( weight = 27 ) solution fluoride.

The number of moles of electrons are required to produce 99. 9 g of aluminum metal from a sample of molten aluminum fluoride = 3mol×99.9g/1g

The number of moles of electrons are required to produce 99. 9 g of aluminum metal from a sample of molten aluminum fluoride = 299.7 moles

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Consider the gibbs energies at 25 ∘ c. substance δ∘f (kj·mol−1) ag (aq) 77. 1 cl−(aq) −131. 2 agcl(s) −109. 8 br−(aq) −104. 0 agbr(s) −96. 9 (a) calculate δ∘rxn for the dissolution of agcl(s)

Answers

The ∆G° for the dissolution of AgCl solid is 55.7 kJ/mol.

What is gibbs free energy?

The gibbs free energy is termed as thermodynamic quantity which is equal to the enthalpy (of a system or process) subtracted by the product of the entropy and the absolute temperature.

The gibbs free energy of the reaction is given by:

∆G°(rxn) =sum of ([∆G°] products)- sum of ( [∆ G°] reactants)

Reaction can be given as:

AgCl(S) » Ag+ (aq) + Cl- (aq)

Gibbs free energy of silver ions = ∆G°f, (Ag+) = 77.1kJ/mol

Gibbs free energy of formation of chloride ions = ∆G°f, (Cl-)= -131. 2kJ/mol

Gibbs free energy of formation of silver chloride solid = ∆ G°f, (AgCl) = - 109.8kJ/mol

The gibbs free energy of the reaction of dissolution of AgCl) :∆ G°rxn:

∆G°rxn = (77.1kJ/mol) – (- 109.8kJ/mol)

55.7kJ/mol

Thus, we found that the ∆G° for the dissolution of AgCL solid is 55.7 kJ/mol.

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48. Which of the following (a) KCI (b) NaCl is called Sylvine? (c) CaCl₂ (d) MgCl₂​

Answers

Answer:

(a) KCI

sylvine, is potassium chloride (KCl) in natural mineral form

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