The compound with the highest boiling point is [tex]CH_{3} CH_{2} OH[/tex] .
So, option C is correct one.
The boiling point depend two factors,
Bonding between moleculeMolecular mass is directly proportional to the boiling point.The boiling point of ether is less than alcohols because alcohol form hydrogen-bonding .The hydrogen bond is strongest bond. So, ethyl alcohol and methyl alcohol has more boiling point than dimethy ether.
The propane molecules have only van-der waals force of attraction, which is weakest force of attraction.So, propane has lowest boiling point.
The molecular mass of ethanol is greater than methaol. So, ethanol has higher boiling point.
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During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. The following observations were recorded when yeast granules were added to hydrogen peroxide.
Observation 1: Fizzing and bubbling took place.
Observation 2: The temperature began to rise.
Based on the observation, justify the type of change (physical or chemical) that took place
The states of matter change to produce the same or the new substance. When yeast is added to hydrogen peroxide bubble of carbon dioxide is formed which indicates chemical change.
What is a chemical change?A chemical change is the formation of a new substance by the chemical alterations in the reactants. The yeast releases products of cellular respiration that react with hydrogen peroxide.
The reaction is exothermic as it releases heat and increases the temperature when measured by the thermometer. The Fizzing and bubbling occur when carbon dioxide reacts with H₂O₂ to produce a new substance.
Therefore, addition of yeast to hydrogen peroxide is a chemical change.
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Answer:
The type of change that took place is most likely a chemical change, due to the recordable reactivity of the hydrogen peroxide to the yeast granules in the experiment.
Explanation:
As stated in the question, the hydrogen peroxide started fizzing and bubbling in reaction to the yeast granules, which is already a sign of a chemical change. The question also states that there was an increase in temperature. This is another sign of a chemical change. Hope this helped (;
Succinic acid is often found in high levels in tumors or biofluids surrounding tumors. it is a weak acid with a pka of 4. 21. what is the ph of a 0. 250 m solution of succinic acid?
The pH of a 0.250m solution of succinic acid is 2.42.
What is succinic acid?Succinic acid is one of the naturally occurring dicarboxylic acid having four carbon, which is produced by LPG.
It can be used in many chemical, food, and pharmaceutical industries.
Given,
pKa = 4.21
As we know that,
pKa = - logKa
4.21 = -logKa
Ka = antilog(-4.21)
Ka = 6.1 × 10^(-5)
Now, let the concentration of [H+] = [A-] = x
Ka = [H+] [A-] /[HA]
6.1 × 10^(-5) = x^2/ (0.25-x)
x^2 = 1.52 × 10^(-5)
x = 3.89 × 10^(-3)
Thus, the concentration of [H+] = [A-] = 3.89 × 10^(-3).
Now, we will calculate the value of pH
pH = - log[H+]
pH = -log(3.89 × 10^(-3))
pH = 2.42
Thus, we found that the pH of the given solution is 2.42.
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A 26-meter-tall statue of buddha in tibet is covered with
279 kg of gold. if the gold was applied to a thickness of
0.0015 mm, what surface area is covered in square
meters)? (gold density = 19.3 g/cm)
0.014559 g/cm³ is the surface area that covered in square.
Definition of surface area -
To recall, the surface area of an object is the total area of the outside surfaces of the three-dimensional object i.e, the total sum of the area of the faces of the object. It is measured in terms of square units. The amount of area covered by the surface of something. The lake has roughly the same surface area as 10 football fields.The surface area is calculated as -
Conversion of units -
[tex]26 m * \frac{100 cm}{1 m} = 2600 cm[/tex]
[tex]279 kg * \frac{1g}{1000 kg} = 0.279 g[/tex]
[tex]0.0015 mm * \frac{0.1 cm}{1mm} = 0.00015 cm[/tex]
Now we use formula for volume -
[tex]Volume = \frac{mass}{density}[/tex]
[tex]= \frac{0.279 g}{19.3 g/ cm^{3} }[/tex]
= 0.014559 g/cm³
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If you halve the volume of a constant amount of gas at a constant temperature, what happens to the pressure?
According to Boyle's law, If one halves the volume of a constant amount of gas at a constant temperature, the pressure will be doubled.
What is Boyle's law?Boyle's law is one of the gas laws that states that the pressure of an ideal gas is inversely proportional to its volume at constant temperature.
Boyle's law equation can be represented as follows:
P = KV
This law suggests that as the pressure of a gas increases, the volume decreases.
Therefore, in accordance with Boyle's law, If one halves the volume of a constant amount of gas at a constant temperature, the pressure will increase times 2 or double.
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How many moles are in 25.3 grams of SO 3?
A.
3.16
B.
0.316
C.
2 020
D.
105
Answer:
B.) 0.316
Explanation:
To find the moles, you need to multiply the given value by the molar mass. The molar mass is made up of each element's atomic mass times their quantities. It is important to arrange the conversion in a way that allows for the cancellation of units.
Atomic Mass (S): 32.065 g/mol
Atomic Mass (O): 15.998 g/mol
Molar Mass (SO₃): 32.065 g/mol + 3(15.998 g/mol)
Molar Mass (SO₃): 80.059 g/mol
25.3 grams SO₃ 1 mole
------------------------- x ------------------------- = 0.316 moles SO₃
80.059 grams
If a parcel of air has a temperature of -1. 1c, what is saturation mixing ratio for this parcel?
The saturation mixing ratio for this parcel is 3.5
Saturation mixing ratio:
The value of the mixing ratio of saturated air at the specified temperature and pressure; a thermodynamic function of the state.
A thermodynamic diagram can be used to directly read this value. The saturation mixing ratio speaks of saturation in relation to a plane surface of pure water without any other qualifier. Additionally, saturation mixing ratios can be defined in relation to a flat ice surface.
The mass of water vapor to the mass of dry air (Md) in a parcel of air at saturation is known as the saturation mixing ratio. In other words, the saturation mixing ratio is the most water vapor a package can contain without condensing. The saturation mixing ratio on the Skew-T is represented by the mixing ratio line that passes through the temperature.
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Assuming an experimental value of enthalpy of –655 kj/mol and a true value of –603, what is the percent error of the experiment? use a calculator and round to the nearest hundredth as well as the absolute value of the percentage. %
8.62%
8.62% is the percent error of the experiment.
Rounding to the nearest hundredth value will be 8.620.
Determine the difference between the figures provided and divide by the actual value to find the percent error.(-655 - -603)/(-603) = 0.0862
Multiply by 100%,
(0.0862) x 100% = 8.62%
What is percent error?The percent error is the difference between the estimated value and the actual value in relation to the actual value.
What does percent error enable us to establish?Error margins are easily understood when expressed as a percentage. It reveals the size of the inaccuracy. A 3-percent error value, for example, indicates that your measured number is quite near to the true amount. A 50% margin, however, indicates that your measurement is far from the true number.The significance of percentage errorWhen you measure something in an experiment, the percentage of mistakes indicates the size of your errors. Greater proximity to the accepted or genuine value is indicated by smaller values.To learn more about percent error visit:
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24. 00 ml of a 0. 25 m naoh solution is titrated with 0. 10m hcl. What is the ph of the solution after 24. 00 ml of the hcl has been added?.
The pH of the solution is 12.88.
Calculation:
millimoles of NaOH = volume x Molarity
= 24.00 mL x 0.25 M
= 6.00 mmole
millimoles of HCl = 24.00 mL x 0.10 M
= 2.40 mmole
Total volume = 48.00 mL
NaOH + HCl → NaCl + H2O
initial 6.00 0 0 0
added 2.40
change -2.40 -2.40 +2.40 +2.40
equilibrium 3.60 0 2.40 2.40
The pH is determined by the excess of NaOH present.
[NaOH] = millimoles/volume
= 3.60/48.00
= 0.075 M
pOH = -log (OH⁻).
= -log (0.075)
= 1.12
Then
pH + pOH = pKw = 14.00.
pH = 14 - pOH
pH = 14 - 1.12
pH = 12.88
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Which atom absorbs more energy- one in which an electron moves from the the second shell to the third shell, or an atom which an electron moves from the first to the third shell?
An atom which an electron moves from the first to the third shell atom absorbs more energy.
An atoms may occupy different energy states . The energy states are discrete , that means they occur at specific values only. Therefore an atom can only move to a new energy level if it absorbs or emits an amount of energy that exactly corresponds to the difference between two energy levels.
The lowest possible energy levels that the atom can occupy is called ground state.The energy levels which is higher to the ground state is called excited state.
The more energy absorb when electron move from first to third because in this second energy level have to pass to reach at third energy level.
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How many moles of h2o are produced in neutralization when 1. 5 mole of mg(oh)2 reacts with h2so4?
There are 3 moles of [tex]H_{2} O[/tex] are produced in neutralization when 1. 5 mole of [tex]Mg(OH)_{2}[/tex] reacts with [tex]H_{2} SO_{4[/tex]
The neutralization reaction between magnesium hydroxide and sulfuric acid is given as,
[tex]Mg(OH)_{2} + H_{2} SO_{4[/tex] → [tex]MgSO_{4} + 2H_{2} O[/tex]
from above chemical equation , we can conclude the molar ratio = 1:2
It means two moles of water molecule is produce from one mole of magnesium hydroxide.
So, number of moles of water molecules produced from 1. 5 mole of magnesium hydroxide = 1. 5 mole× 2 = 3 moles
Therefore, number of moles of water molecules produced from 1. 5 mole of magnesium hydroxide is 3 moles.
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Liquid 1 reacts with liquid 2, producing a solid and a gas. using this scenario, which supports the law of conservation of mass? mass of liquid 1 mass of solid = mass of liquid 2 mass of gas mass of liquid 1 – mass of solid = mass of liquid 2 – mass of gas mass of liquid 1 – mass of liquid 2 = mass of solid mass of gas mass of liquid 1 mass of liquid 2 = mass of solid mass of gas
mass of Liquid 1 + mass of solid = mass of Liquid 2 + mass of gas mass of Liquid
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed. Hence, the quantity of mass is conserved over time.
What is Law of conservation of mass ?According to the rule of conservation of mass, mass is neither generated nor destroyed during a chemical process. For instance, when coal is burned, the carbon atom in it transforms into carbon dioxide. The carbon atom transforms from a solid to a gas, yet its mass remains constant.
The understanding that substances do not actually vanish as a result of a reaction, despite what might appear to be the case, but rather change into another material of equal mass, was made possible by the law of conservation of mass, which was essential to the development of chemistry.Learn more about Law of conservation of mass here:
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The oxygen used for preheating and the fuel gas are combined in the ____ chamber before burning.
Answer:
Mixing chamber
What is the standard potential, e∘celle∘cell, for this galvanic cell? use the given standard reduction potentials in your calculation as appropriate
0.56 V is the standard potential, e∘cell∘, for this galvanic cell.
The standard reduction potential can be calculated by subtracting the standard reduction potential for the reaction occurring at the cathode from the standard reduction potential for the reaction occurring at the anode. The minus sign is necessary because oxidation is the polar opposite of reduction. The total cell potential can be calculated using the formula E0cell=E0red+E0oxid. Step two is to find a solution. Before the two reactions may be integrated, the number of electrons gained in the reduction must match the number of electrons lost in the oxidation
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The standard potential for the given galvanic cell is 0.477 V
What is electrode potential?The electrode potential is the electromotive force of a galvanic cell built using a standard reference electrode and another electrode whose potential is to be found.
There are two types of electrode potential
Oxidation potential - The potential associated with oxidation reaction is known as oxidation potential
Reduction potential - The potential associated with reduction reaction is known as reduction potential
At the anode, oxidation occurs
[tex]Sn(s)\rightarrow Sn^{2+}(aq)+2e^-[/tex]
At the cathode, reduction occurs
[tex]Cu^{2+}(aq)+2e^-\rightarrow Cu(s)[/tex]
[tex]E^o_{cell} =E^o_{cathode} -E^o_{anode}[/tex]
= 0.337 - (-0.140)
= 0.477 V
Thus, The standard potential for the given galvanic cell is 0.477 V
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Disclaimer: The question was given incomplete on the portal. Here is the complete question
Question: What is the standard potential, E∘cell, for this galvanic cell? Use the given standard reduction potentials in your calculation as appropriate.
[tex]Sn^{2+}(aq)+2e^-\rightarrow Sn(s)[/tex], E°red=−0.140 V
[tex]Cu^{2+}(aq)+2e^-\rightarrow Cu(s)[/tex], E°red=+0.337 V
Generating a rate law is complicated when the rate-determining step is preceded by a?
By generating a rate law is complicated when the rate-determining step is preceded by 'a' is a Equilibrium reaction.
What is rate law?The rate law shows about the rate of chemical reaction depends on reactant concentration.
According to rate law, the rate of reaction is directly proportional to the concentration of reaction which is raised to a stiochiometric coefficient which is determined experimentally.
Thus, from above we concluded that if the preceding reaction is an equilibrium, that compromises the simplicity of writing the rate law from the stiochiometry of the rate determining step will be used up in the reverse reaction of the equilibrium.
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Heliox is a mixture of helium and oxygen gas used to help patients with breathing difficulties. It is also used for scuba diving. The total pressure in a tank of heliox is 208 atm. If the mole fraction of o2 is 0. 220, what is the partial pressure of he in the tank?.
It should be remembered that the mole fraction of any component making up a system is 1.
A mole fraction is what?the proportion of the moles of one component to the total moles of all the components in a solution or other mixture.
What is mole fraction and an example of it?The ratio of molecules of one component in a mixture is known as a mole fraction. For instance, if the methane mole fraction in a gas is 0.90, then this implies that 90% of the molecules are methane. The mixture also contains 90% methane since the amount fractions resemble mole fractions.
How is the mole fraction determined?By dividing the moles of the solute by the total moles of the substances in the solution, you may determine the mole fraction of the solute.
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13. Which compound reacts third fastest with fuming sulfuric acid? a. Toluene b. Chlorobenzene d. Nitrobenzene e. Benzene c. Aniline.
Toluene compound reacts third fastest with fuming sulfuric acid.
The reaction is attached in figure -
When nitration of toluene is carried out in presence of fuming nitric acid and fuming sulfuric acid under 333 K temperature , 2, 4, 6-trinitro toluene is the final product .This 2, 4, 6-trinitro toluene is also called TNT. TNT is used as explosive.What is toluene?
Toluene is a common ingredient in degreasers. It's a colorless liquid with a sweet smell and taste. It evaporates quickly. Toluene is found naturally in crude oil, and is used in oil refining and the manufacturing of paints, lacquers, explosives (TNT) and glues.What is a toluene used for?
Toluene is found naturally in crude oil, and is used in oil refining and the manufacturing of paints, lacquers, explosives (TNT) and glues. In homes, toluene may be found in paint thinners, paintbrush cleaners, nail polish, glues, inks and stain removers.Learn more about Toluene
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How many coulombs passed through the solution if 11. 5 a of current was applied for 4. 00 h?
There are 165600 coulombs passed through the solution if 11. 5 A of current was applied for 4. 00 h.
Calculation,
Formula used :
Q = It
Where Q = charge passing through the solution = ?
I = current passed through the solution = 11. 5 A
and , t = time = 4. 00 h
Putting the value of current , and time
Q = 11. 5×4. 00 h =11. 5× 46×3600 A×s = 165600 coulombs
The SI unit of charge is coulombs.
The SI unit of current is ampere.
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A bug walking on the surface of a puddle is depending on what property of water? high surface tension because of the attraction between water molecules capillary action of water molecules to narrow objects such as bug legs low density of liquid water because of the bent molecular shape adhesion of water molecules to nonpolar structures such as hair and skin
High surface tension because of the attraction between water molecules helps bugs walk on the surface of the water.
How does surface tension help insects walk on water surface?Surface tension is important for insects that walk on water. They would sink without it. When compared to air molecules, water molecules are more strongly attracted to one another. Due to cohesion, this makes them attract and cling to one another strongly in a body of water. The water molecules between the molecules at the water's surface are more strongly attracted to one another because they do not have water molecules surrounding them on all sides.
As a result, there is an inward force that forms a "film" at the surface and causes the water to act as though a thin membrane were covering it. Surface tension is the term for this phenomena.
Surface tension can be used to the advantage of some insect and spider species. They don't break the water's surface when they stand on it because their negligible weight is insufficient to dissipate the force of surface tension. Instead, they make dimples or indentations in the surface with their feet, which rebound to move the insect ahead. This enables them to move swiftly over ponds, lakes, and rivers in search of prey.
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How does the valency of an element show its reactiveness in a chemical reaction
Answer:
Within each group of metals, reactivity increases as you go down the group. The valence electrons are less tightly bound and easier to remove, because they are farther away from the nucleus of the atom. A nonmetal tends to attract additional valence electrons to attain a full valence shell.
Hope it's helpful to you
The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0 grams. What is the percent yield?
The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0 grams. The percent yield of the reaction is 56 %.
What is Theoretical yield and Actual Yield ?The amount can be produced from the correct computation is called Theoretical Yield.
The actual amount which is produced in the experiment is called Actual Yield.
How to calculate the percentage yield ?To calculate the percentage yield use the formula
[tex]\text{Percentage Yield} = \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100 \%[/tex]
Here,
Actual yield = 42 grams
Theoretical yield = 75 grams
Put the value in above expression we get
[tex]\text{Percentage Yield} = \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100 \%[/tex]
[tex]= \frac{42\ g}{75\ g} \times 100 \%[/tex]
= 56 %
Thus from the above conclusion we can say that The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0 grams. The percent yield of the reaction is 56 %.
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What eventually happens to a gas if its pressure is increased?
Answer:
According to Boyle's law pressure of a particular amount of gas is inversely proportional to the volume of the gas.So, when we increase the pressure of the gas the volume of the gas decrease and the gas start to condense.Thus if the pressure of a gas increases it starts to condense.Explanation:
Hope It Helps!!!!
Answer:
See belwo
Explanation:
First it becomes a compressed gas.... further pressure will cause it to condense into a liquid.
If we combine the reaction of an acid protonating water and the reaction of its conjugate base deprotonating water, the net reaction after canceling common terms is:_________
After eliminating common terms, the net reaction occurs when we combine the reactions of an acid protonating water and its conjugate base deprotonating water is the autoionization of water.
What is the autoionization of water?The autoionization of water demonstrates that water can react with itself because acids and bases should interact with one another.
Here, the sound should be strange. Additionally, the water molecules should experience a small degree of proton exchange.
Thus, the correct option is c. The autoionization of water.
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The question is complete. Your complete question is given below:
a. The acid-base reaction between the acid and its conjugate base.
b. The synthesis of a complex between the acid and its conjugate base.
c. The autoionization of water.
d. None of the above.
Changes in the composition of the atmosphere have caused gradual changes in earth's _______ throughout history, causing changes in plant and animal life that contributed to mass extinctions.
climate
Changes in the composition of the atmosphere have caused gradual changes in earth's climate throughout history, causing changes in plant and animal life that contributed to mass extinctions.
The following are some of the reasons:
UV lightclimatepollutantshydrofluorocarbonsheat
The surface of the Earth warms up as sunlight strikes it. Surface-emitted infrared light is absorbed in the atmosphere and transformed into heat. The temperature close to the surface rises as a result of this heat being trapped in the atmosphere.UV light:indirect impacts of climate change on UV radiation from the surface. By changing the concentrations of ozone, UV-absorbing tropospheric gases, aerosols, and clouds in the atmosphere, climate change may have indirectly affected UV radiation levels in the past. These influences are probably going to persist in the future.climate:People are at risk from food and water shortages, greater flooding, high heat, an increase in disease, and economic loss due to climate change. Conflict and human migration are potential outcomes. Climate change is the top hazard to world health in the twenty-first century, according to the World Health Organization (WHO).pollutants:these are also resulting in the increase of temperature of the Earth and is also damaging ozone layer.To learn more about the changes in earth visit:
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Which of the following is true: A. Gamma rays are too dangerous to be used in a medicinal way. B. Gamma radiation is used commonly used in smoke detectors C. Gamma radiation should never be used on food products. D. Gamma radiation is frequently used on food to kill bacteria.
Answer:
D
Explanation:
Gamma radiation penetrates the cell wall of prokaryotic organisms such as bacteria and can inhibit their metabolic functions as well as destroy their DNA.
Debunking the other answers:
A is incorrect as Gamma radiation is used in the treatment of cancer via radiotherapy.
B is incorrect as Gamma rays are too small and would just penetrate any smoke particles.
C is incorrect because Gamma rays are used to disinfect food products to prevent food borne illness. Irradiation is safe to use on food and does not make it radioactive.
Thus, D is correct.
What type of response to chemical exposure is an immediate or rapid harmful reaction?.
An acute effect is an immediate or rapid harmful reaction to a exposure.
A chronic effect is a permanent/ long-lasting consequence from exposure to a single dose or to repeated lower doses of a harmful substance.
What is an acute effect?
Acute (short-term) effects show up immediately or soon after exposure to the chemical. They may be minor, like nose or throat irritation, or they could be serious, like eye damage or passing out from chemical vapors. It is an adverse effect on a human or animal body, with severe symptoms developing rapidly and coming quickly to a crisis.
What is a acute effect example?
Examples of acute health effects include dizziness, skin irritation, and throat irritation. Keep in mind that a chemical may cause both acute and chronic effects.
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The conversion of the fatty acid palmitate (c16) to carbon dioxide via β-oxidation, the citric acid cycle and oxidative phosphorylation yield approximately ____ atp equivalents
The conversion of the fatty acid palmitate (C-16) to carbon dioxide via β-oxidation, the citric acid cycle and oxidative phosphorylation yield approximately 106 atp equivalents.
The most prevalent kind of fatty acid with sixteen carbon atoms without carbon-carbon double bonds would be palmitic acid. There must be a maximum of seven cycles of beta-oxidation in order to totally degrade the fatty acid. 8 acetyl-CoA molecules, 7 NADH molecules, with 7 FADH2 molecules are produced as a result of this.
The primary enzyme, CAT-1, catalyzes the production of acylcarnitine carnitine, which provides the rate-limiting step in beta-oxidation.
Therefore, the conversion of the fatty acid palmitate (C-16) to carbon dioxide via β-oxidation, the citric acid cycle and oxidative phosphorylation yield approximately 106 atp equivalents.
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Sample Response: The change in her position (from beginning to end), along with the direction, is considered her displacement. This value is a measurement and a direction. The total distance along the path from her starting point to her end point is considered her distance. This value is a measurement only. What did you include in your response? Check all that apply.
The sample response given in the question is right. Displacement is the shortest distance between the initial and final points of a body. Distance is the length of actual path of the body between initial and final positions.
To find the answer, we need to know more about the distance and displacement.
How distance differ from displacement?Displacement is the shortest distance between the initial and final points of a body.It is the change in position with a fixed direction.Displacement is a vector quantity and can be positive, negative or zero values.Distance is the length of actual path of the body between initial and final positions.It's a scalar quantity and it can be positive or zero.The magnitude of displacement is less than or equal to the distance travelled.Thus, we can conclude that the given sample response is right.
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When a known quantity of compound, at a known concentration, is added to a known volume of another compound to determine the concentration of the latter, the process is referred to as?
A titration is a method for figuring out the concentration of an unknown solution by using a solution with known concentration.
What is Titration?
Titration, commonly referred to as titrimetry, is a quantitative analysis technique that enables chemists to estimate the quantities of specific chemicals in a sample that are unknown.
A known volume of one solution of known concentration (referred to as a titrant) is slowly added to a known volume of another solution of unknown concentration (referred to as analyte) throughout the basic titration procedure until the reaction reaches neutralization.
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A sample of 7.70 l of nh3 (ammonia) gas at 22 ∘c and 735 torr is bubbled into a 0.250 l solution of 0.400 mol l−1 hcl (hydrochloric acid). the kb value for nh3 is 1.8×10−5. part a assuming all the nh3 dissolves and that the volume of the solution remains at 0.250 l , calculate the ph of the resulting solution. express your answer numerically to two decimal places. view available hint(s)
The pH of the solution is 9.14
For ammonia:To calculate the amount of hydrogen gas collected, we use the equation given by ideal gas which follows:
PV = nRT
P= Pressure of the gas = 735 torr
V= volume of the gas = 7.70 l
T= Temperature of the gas= 22°C (22+273K) = 295K
R= Gas constant= 62.364 L torr/mol/K
n = number of moles of ammonia = ?
By substituting the values in the above equation, we get:
735×7.70 = n × 62.364 × 295
5659.5 = n × 18397.38
n= 5659.5/18397.38
n= 0.3076
For hydrochloric acid:To calculate the number of moles for given molarity, we use the equation:
Molarity of the solution = [tex]\frac{moles of solute}{volume of solution}[/tex]
Molarity of hydrochloric acid = 0.400 M
Volume of solution = 0.250 L
Putting values in above equation, we get:
0.400= moles of solute/0.250
moles of hydrochloric acid = 0.1 mol
The chemical reaction for ethylamine and HCl follows the equation:
NH3+HCl---> NH4Cl
Initial: 0.316 0.18
Final: 0.136 - 0.18
volume of the solution = 0.250 l
To calculate the pOH of basic buffer, we use the equation given by Henderson Hasselbalch:
pOH = pKb + log([tex]\frac{salt}{base}[/tex])
pOH = pKb + log([tex]\frac{NH4Cl}{NH3}[/tex])
it is given:
pKb = negative logarithm of base dissociation constant of ammonia =
-log(1.8 × [tex]10^{-5}[/tex]) = 4.74
[NH4Cl] = 0.18/0.450
[NH3] = 0.136/0.450
On substituting the values we get,
pOH= 4.74 + log ([tex]\frac{0.18/0.250}{0.136/0.250}[/tex])
pOH = 4.74 + 0.12
pOH= 4.86
pH + pOH= 14
pH= 14-pOH
= 14-4.86
pH = 9.14
pH of the solution = 9.14
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What is the study of living things called?
OA. Earth science
O B. Physics
O C. Chemistry
O D. Biology
Answer:
D
Explain:
Biology because normally everyone just studies under it so that is my answer for you i hope its right.