Cd2+(aq) + 2e- ---> Cd(s) , E° = -0.40 V Fe2+(aq) + 2e- ----> Fe(s) , E° = -0.44 V Since standard reduction potential.
Galvanic Cell: A chemical cell, also known as an electrochemical cell, is a device that transforms the chemical energy generated during a red-ox reaction into electrical energy. In honor of Luigi Galvanic and Alessandro Volta, who conducted the first experiments on the conversion of chemical energy into electrical energy, these are also known as galvanic or voltaic cells.
A spontaneous red-ox reaction occurs in an electrochemical cell in an indirect manner, and the reduction in free energy that occurs during the chemical reaction manifests as electrical energy. In an indirect red-ox reaction, the reduction and oxidation processes take place in two different containers known as half-cells.
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The cell potential is 0.01934 V at 25°C.
What is a galvanic cell?A galvanic cell, also known as a voltaic cell, is an electrochemical cell that converts the chemical energy generated by spontaneous redox reactions into electrical energy.
The main components of a galvanic cell are
Anode – Oxidation occurs at the anode
Cathode – Reduction occurs at the cathode
Salt bridge – consists of electrolytes that are needed to complete the circuit in a galvanic cell.
Half-cells – It is important as reduction and oxidation reactions are separated into compartments.
External circuit – it helps in Conducting the flow of electrons between electrodes
At cathode,
[tex]Cd^{2+}(aq) + 2e^-\rightarrow Cd(s)[/tex]
At anode,
[tex]Fe(s)+2e^-\rightarrow Fe^{2+}(aq)[/tex]
Overall cell reaction
[tex]Fe(s)+Cd^{2+}(aq)\rightarrow Fe^{2+}(aq) + Cd(s)[/tex]
[tex]E^o_{cell} = E^o_{cathode} - E^o_{anode}[/tex]
= -0.40 -(0.44) = 0.04 V
Nernst equation is given by
[tex]E_{cell} = E^o_{cell} - \frac{2.303RT}{nF} logQ[/tex]
At 25°C
[tex]E_{cell} = E^o_{cell} - \frac{0.0592V}{n} logQ[/tex]
Here, n = 2 and log Q = log [tex]\frac{0.250}{0.050}[/tex] = 0.699
[tex]E_{cell}[/tex] = 0.01934 V
The cell potential is 0.01934 V at 25°C
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A 25. 0-ml sample of 1. 00 mnh3is titrated with 0. 15 mhcl. what is the ph of the solution after 15. 00 ml of acid have been added to the ammonia solution? kb= 1. 8 10-5
The pH can be determined by the base dissociation constant value (Kb). The pH of the solution after 15 mL of ammonia is added to the solution will be 10.26.
What is pH?The pH of the solution can be given by the pOH value that is determined by the concentration and the base dissociation constant.
The balanced chemical reaction is given as,
HCl + NH₃ → NH₄Cl
The moles before reaction was 0.015L× 0.15M = 0.00225 moles and, 0.025 L × 1.00 M = 0.025 moles
The moles after reaction are 0.00225 moles - 0.025 moles = 0.02275 moles
pOH is calculated as,
pOH = 4.74 + log ( 0.00225 ÷ 0.02275 )
= 3.73
Further pH is calculated as,
pH = 14 - 3.73
= 10.26
Therefore, 10.26 is the pH of the solution.
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Methane (CH4), ammonia (NH3), and oxygen (O2) can react to form hydrogen cyanide (HCN) and water according to this equation:
CH4 + NH3 + O2 à HCN + H2O
You have 8 g of methane and 10 g of ammonia in excess oxygen. Answer the following questions:
· What is the balanced equation for this reaction?
· Which reagent is limiting? Explain why.
· How many grams of hydrogen cyanide will be formed? Show your work.
Answer:
-----> 2 CH₄ + 2 NH₃ + 3 O₂ -----> 2 HCN + 6 H₂O
-----> CH₄ = Whichever reactant produces the smaller amount of product is the limiting reagent. This is because the limiting reagent runs out before all of the other reactant is completely used. Because CH₄ produces the smaller amount of product, it is the limiting reagent.
-----> 13.5 grams HCN
Explanation:
Part 1:
An equation is balanced when there is an equal amount of each reactant on both sides of the reaction. These amounts can be modified by adding coefficients in front of the molecules.
The unbalanced equation:
CH₄ + NH₃ + O₂ -----> HCN + H₂O
Reactants: 1 carbon, 7 hydrogen, 1 nitrogen, 2 oxygen
Products: 1 carbon, 3 hydrogen, 1 nitrogen, 1 oxygen
The balanced equation:
2 CH₄ + 2 NH₃ + 3 O₂ -----> 2 HCN + 6 H₂O
Reactants: 2 carbon, 14 hydrogen, 2 nitrogen, 6 oxygen
Products: 2 carbon, 14 hydrogen, 2 nitrogen, 6 oxygen
Part 2:
You can determine the limiting reactant by converting each reactant mass (besides O₂) to a product mass. Whichever reactant produces the smaller amount of product is the limiting reagent. This is because the limiting reagent runs out before all of the other reactant is completely used.
Let's convert to HCN because Part 3 also wants to know how much HCN is produced. To find this amount, you need to (1) convert grams reactant to moles reactant (via their molar masses), then (2) convert moles reactant to moles HCN (via the mole-to-mole ratio from equation coefficients), and then (3) convert moles HCN to grams HCN (via its molar mass).
Molar Mass (CH₄): 12.011 g/mol + 4(1.008 g/mol)
Molar Mass (CH₄): 16.043 g/mol
Molar Mass (NH₃): 14.009 g/mol + 3(1.008 g/mol)
Molar Mass (NH₃): 17.033 g/mol
Molar Mass (HCN): 1.008 g/mol + 12.011 g/mol + 14.009 g/mol
Molar Mass (HCN): 27.028 g/mol
8 g CH₄ 1 mole 2 moles HCN 27.028 g
-------------- x ---------------- x ---------------------- x ---------------- = 13.5 g HCN
16.034 g 2 moles CH₄ 1 mole
10 g NH₃ 1 mole 2 moles HCN 27.028 g
--------------- x ---------------- x ----------------------- x ---------------- = 15.9 g HCN
17.033 g 2 moles NH₃ 1 mole
Because CH₄ produces the smaller amount of product, it is the limiting reagent. Therefore, the actual amount of HCN produced is 13.5 g.
Calculate the mass of 3.4 moles of nitric acid (hno3). explain the process or show your work by including all values used to determine the answer.
Answer:
6.34917360^25g
Explanation:
It's been a while since I've done this type of problem so I'm not making any promises that its right hahaha, but I hope it helps anyway. Please let me know whether I'm right or not!
Which reason best explains why both venus' and mars' atmospheres are primarily carbon dioxide, but the earth's is much less than 1arbon dioxide?
Because carbon dioxide dissolves in water and is transported by rain to the surface where it combines with rocks to generate carbonates, the Earth's atmosphere contains significantly less carbon dioxide than Venus's atmosphere.
Why does Earth's atmosphere have so much less carbon dioxide compared to Venus?Since Venus' atmosphere is around 100 times thicker than the earth's and extremely dense. Venus must be sufficiently close to the Sun for the little carbon dioxide in its early atmosphere to have heated the surface and released additional carbon dioxide into the atmosphere. Nitrogen makes up 79% of the atmosphere on Earth, along with oxygen (20%) and a trace amount of other gases including carbon dioxide and water vapor. On Venus and Mars, however, carbon dioxide makes up the majority of the atmosphere.
In Venus's original ocean drained, water vapor molecules were dispersed by ultraviolet light, and hydrogen was released into space. There was no longer any surface water, and the amount of carbon dioxide increased.
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Anil accidentally swallows a substance that activates the complement cascade in the absence of bound antibodies. this substance would:_______
Answer:
This substance would cause cause an extensive cellular damage to Anil.
how to build 6 individual atoms?
The 6 models of the atom:
1. John Dalton's atomic model: Daltons Billiard Ball (Solid Sphere) Model
2. J.J. Thomson's model: Plum Pudding model
3. Ernest Rutherford's model: Nuclear model
4. Niels Bohr's model: Planetary model
5. Erwin Schrdinger's model: Electron Cloud Model/Quantum Model
6. Wave mechanical model
AtomThe smallest component that makes up a chemical element is an atom. Atoms that are neutral or ionized are the building blocks of all solids, liquids, gases, and plasma. A normal atom is 100 picometers across, which is incredibly small. Because of quantum effects, they are so small that it is impossible to predict their behavior with sufficient precision using classical physics, as if they were, say, tennis balls. One or more electrons are attached to the nucleus of every atom, which is made up of a nucleus. Protons and neutrons, in various numbers, make up the nucleus. Neutrons exist only in the most prevalent type of hydrogen. An atom's nucleus makes up more than 99.94% of its mass.
how to build 6 individual atoms?
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How much sludge in cubic feet per person per year accumulates in lagoon systems?
1 to 2 feet (cubed) per person per year can be accumulated in lagoon systems.
What is meant by lagoon systems?Lagoons are basin-like to collect, retain, and treat wastewater for a predefined amount of time. They are pond-like bodies of water.
Components of lagoon systems:A septic tank plus a small earthen pond with a constant 3-foot depth make up a lagoon system. A septic tank is a sizable, underground, watertight, corrosion-resistant container that collects untreated sewage from a home's plumbing drains.Dumping by septage hauling trucks is a common cause of slug loading into lagoons.Depth of sludge on the bottom of a lagoon that indicates that the lagoon should be cleaned is 1 foot.carbon dioxide gas is used and produced by algae, causing variations in a lagoon's pH.Biological growth provides enough oxygen to sufficiently aerate most lagoons for treatment processes to work.pH above 8.5 keeps lagoons from generating odors.To learn more about lagoon systems visit:
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What mass of kcl in grams must be added to 500 ml of a 0. 15 m kcl solution to produce a 0. 40 m solution.
91.4 grams mass of KCl is required.
Concentration = moles/Volume
2.45M=mol/0.5L
2.45M⋅0.5L=mol
mol=1.225
Convert no. of moles to grams using the atomic mass of K + Cl
1.225mol⋅(39.1+35.5)/gmol
1.225mol⋅74.6g
mol=1.225⋅74.6g = 91.4g
What is Concentration?The formula for determining concentration from moles and volume is pretty straightforward. Simply divide the volume of solution by the moles of solute.The number of moles of a component divided by the sum of the moles in the solution is what is known as a mole fraction, which is a unit of concentration. Mole fraction is a unit-free expression because it represents a ratio.To learn more about concentrations, refer to the given link:
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Drag the tiles to the correct boxes to compete the pairs. identify the types of chemical reactions occurring in the chemical equations. respiration photosynthesis combustion reaction of fossil fuels methane oxygen → water carbon dioxide heat arrowright glucose oxygen → carbon dioxide water energy arrowright water carbon dioxide sunlight → oxygen glucose arrowright
Photosynthesis: water + carbon dioxide + sunlight → oxygen + glucose
Respiration: glucose + oxygen → carbon dioxide + water + energy
Combustion: methane + oxygen → water + carbon dioxide + heat
What is photosynthesis?The process by which plants convert carbon dioxide, water, and sunshine into oxygen and sugar-based energy is known as photosynthesis.
water + carbon dioxide + sunlight → oxygen + glucose
What is respiration?The sugars created during photosynthesis are combined with oxygen during the process of respiration in plants to create energy for plant development.
glucose + oxygen → carbon dioxide + water + energy
What is a combustion reaction?Combustion is a chemical process between substances that often involves oxygen and produces heat and light in the form of flame.
methane + oxygen → water + carbon dioxide + heat
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Photosynthesis: water + carbon dioxide + sunlight → oxygen + glucose
Respiration: glucose + oxygen → carbon dioxide + water + energy
Combustion: methane + oxygen → water + carbon dioxide + heat
What is photosynthesis?Green plants and certain other organisms convert light energy into chemical energy through a process called photosynthesis. Light energy is gathered and utilized during photosynthesis in green plants to change water, carbon dioxide, and minerals into oxygen and energy-rich organic molecules.What is respiration?The sugars created during photosynthesis are combined with oxygen during the process of respiration in plants to create energy for plant development. Respiration contrasts photosynthesis in several ways. Plants make their own sustenance to survive in the natural world.What is combustion?Combustion is a chemical reaction that takes place between two or more substances and releases heat and light in the form of a flame.To learn more about photosynthesis visit:
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As energy moves out from the sun’s core toward its surface, it first travels by __________, then by __________, and then by ________
Energy leaves the Sun's core and goes by radiation, convection, and radiation on its way to the surface.
Energy leaves the sun's core and initially travels towards the radiation zone. In the radiation zone, the gas is tightly compressed. Here, electromagnetic waves are absorbed and reradiated to transfer energy. Energy can take more than 100,000 years to get through this area because it is so dense.
Thus, energy radiates out initially from the core before being delivered by convection to the outer layers.
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A coin collector has a bag of 50 pennies. What is the percent abundance of the post-1982 pennies? ASAP ANSWER PLS.
The percent abundance of the post-1982 pennies is 56%.
What is percent abundance?Percent abundance is the percentage amount of all naturally occurring isotopes of an element.
Percent abundance of the post-1982 penniesThe percent abundance of the post-1982 pennies is calculated as follows;
percent abundance = number of post-1982 pennies / total number of pennies x 100%
percent abundance = (28) / (50) x 100%
percent abundance = 56%
Thus, the percent abundance of the post-1982 pennies is 56%.
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Answer:
FOR PRE 44
Explanation:
22/50X100=44
What is the carbon nucleophile which attacks molecular bromine in the acid-catalyzed α-bromination of a ketone?
The carbon nucleophile which attacks molecular bromine in the acid-catalyzed α-bromination of a ketone an acetylide. The Organometallic reagents like those used in the Grignard, Blaise, Reformatsky, and Barbier reactions as well as reactions involving the organolithium reagents and acetylides are frequently used as carbon nucleophiles.
These chemicals are frequently employed in nucleophilic additions. Compounds or intermediates that contain an electron-rich carbon atom are known as carbon-centered nucleophiles because they have the ability to donate an electron pair from that carbon atom to an electrophile. When writing resonance structures, the strong negative nature of a metal-bonded the carbon is apparent.
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The instructions for the experiment direct you to prepare 30 mL of 1.5 M HCl solution. In the chemical closet, you locate an 18M stock solution of HCl. What volume of the 18M HCl is needed to make the solution?
The volume of the 18M HCl needed to make the solution will be 2.5 mL.
DilutionAccording to the dilution principle, the number of moles of solutes in a solution before and after dilution must remain the same.
Since, mole = molarity x volume
Thus, molarity x volume before dilution = molarity x volume after dilution.
Mathematically, the equation is written as: m1v1 = m2v2
In this case, m1 = 18 M, m2 = 1.5 M, and v2 = 30 mL.
What we are looking for is v1, the amount of the stock HCl needed for dilution.
v1 = m2v2/m1 = 1.5 x 30/18 = 2.5 mL.
Thus, 2.5 mL of the stock HCl would be needed.
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Draw the mechanism for the acid-catalyzed reaction of acetic acid (ethanoic acid) with the methanol to yield methyl acetate (methyl ethanoate)
When ethanoic acid react with methanol in the presence of H⁺ or heat it gives methyl ethanoate and water.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now write the chemical equation
CH₃COOH + CH₃OH ⇄ CH₃COOCH₃ + H₂O
Here
CH₃COOH is Ethanoic acid (Acetic acid)
CH₃OH is Methanol (Methyl Alcohol)
CH₃COOCH₃ is Methyl ethanoate (Methyl Acetate)
H₂O is water
Thus from the above conclusion we can say that When ethanoic acid react with methanol in the presence of H⁺ or heat it gives methyl ethanoate and water.
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2 no2(g) <—> n2o4(g) if the partial pressure of each gas is set a 5. 0 atm at 25°c, is the system at equilibrium?
Yes the system is at equilibrium if reactants and products are at equilibrium at 10⁻³ < K <10³.\
Chemical Equilibrium:When opposing reactions are happening at the same pace, chemical equilibrium happens.
[tex]N_2O_4 (g)[/tex] → [tex]2 NO _2(g)[/tex]
We represent the system's equation with a double arrow since the forward and reverse processes are both active in an equilibrium state.
Forward Reaction: Rate Law:
[tex]N_2O_4(g)[/tex] → [tex]2 NO_2 (g)[/tex] Rate = [tex]k_f [N_2O_4][/tex]
Reverse Reaction: Rate Law:
[tex]2 NO_2 (g)[/tex] → [tex]N_2O_4(g)[/tex] Rate = [tex]k_f [NO_2]^2[/tex]
Therefore at equilibrium;
[tex]Rate_f=Rate_r\\[/tex]
[tex]k_f[N_O_4] = k_r[NO_2]^2[/tex]
It becomes:
[tex]\frac{k_f}{k_r} = \frac{[NO_2]^2}{[N_2O_4]} \\[/tex]
[tex]K_e_q = \frac{k_f}{k_r} = \frac{[NO_2]^2}{[N_2O_4]} = a constant[/tex]
The reciprocal of the equilibrium constant of the forward reaction is the equilibrium constant of a reaction moving in the opposite direction.
The reaction is said to have a large amount of both reactants and products at equilibrium at 10⁻³ < K <10³.
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Consider the combustion reaction for octane (C8H18), which is a primary component of gasoline.
2C8 H18 + 25O₂…..16CO2+18H2O
How many moles of CO₂ are emitted into the atmosphere when 16.6 g C8H18 is burned?
CO₂ emitted:
Answer:
1.16 moles CO₂
Explanation:
To find the moles of CO₂, you need to (1) convert grams C₈H₁₈ to moles (via the molar mass) and then (2) convert moles C₈H₁₈ to moles CO₂ (via the mole-to-mole ratio from equation coefficients). It is important that the conversions/ratios are arranged in a way that allows for the cancellation of units. The final answer should have 3 significant figures like the given value.
Molar Mass (C₈H₁₈): 8(12.011 g/mol) + 18(1.008 g/mol)
Molar Mass (C₈H₁₈): 114.232 g/mol
2 C₈H₁₈ + 25 O₂ -----> 16 CO₂ + 18 H₂O
^ ^
16.6 g C₈H₁₈ 1 mole 16 moles CO₂
-------------------- x ----------------- x ------------------------- = 1.16 moles CO₂
114.232 g 2 moles C₈H₁₈
How many significant figures are in this mass ? 25 , 803 , 000 , 000 mg
We have five significant figures in the value 25 , 803 , 000 , 000 mg.
What is significant figures?The term significant figures refers to the numbers of figures to which we can assign a mathematical values. The numbers that we refer to here must be non zero numbers.
The implies that we must look out for the values that are nonzero in the digits shown which is 25 , 803 , 000 , 000 mg. A close look at this values shows us that we have five figures that can be assigned values.
Thus we have five significant figures in the value 25 , 803 , 000 , 000 mg.
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Why does water have a very high boiling point?
Select one:
A. because it forms a three-dimensional pattern called a crystal lattice
B. because it has strong attractions that hold the water molecules together
C. because it is a molecular compound
D. because it does not conduct an electric current
Answer:
B
Explanation:
Hydrogen bonding holds the water molecules together
According to the iupac convention, alkyl substituents on a hydrocarbon chain should be listed in which order?
According to the iupac convention, alkyl substituents on a hydrocarbon chain should be listed in alphabetical without taking prefixes into name.
A hydrocarbon would be an organic molecule in organic chemistry that is made completely of hydrogen as well as carbon. A good example of group 14 hydrides includes hydrocarbons. In general, hydrocarbons lack color and are hydrophobic. Typically, their faint smells are compared to that of gasoline and lighter fluid.
The longest unbroken carbon chain should be found and named.Name the groups that make up this chain but instead identify them.Beginning at the end of the chain closest to a substituent group, fraction the chain sequentially.Give each substituent group a corresponding number but also name to indicate its placement.Therefore, according to the iupac convention, alkyl substituents on a hydrocarbon chain should be listed in alphabetical without taking prefixes into name.
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Which is incorrect? multiple choice at equilibrium, ecell = 0. e > 0 for a spontaneous process. e = 0 for a spontaneous process. δg < 0 for a spontaneous process. δg = 0 at equilibrium.
The incorrect statement is e = 0 for a spontaneous reaction.
e cell = 0The cell potential is 0 at equilibrium.
e > 0 for a spontaneous reactionFor a spontaneous reaction the value cell potential E cell is positive i.e. >0
e = 0 for a spontaneous reactionThis statement is incorrect because the potential of a cell is positive if the reaction is spontaneous. Hence it cannot be zero.
δ g < 0 for a spontaneous reactionFor a spontaneous reaction gibbs free energy δ g value is negative i.e. < 0
δg = 0 at equilibrium.At equilibrium the value of gibbs free energy is zero i.e. δg = 0
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The hydrolysis of esters in base is called ________. a. the hunsdiecker reaction b. transesterification c. saponification d. the dieckmann condensation
The hydrolysis of esters in base is called saponification .
So, option C is correct one.
The saponification is the process that involves conversion of fats , oils , lipids into soap and water in the presence of alkaline medium. Saponification is the process of making soap.
During the saponification process, the mixture has an acidity, which tells that it's not safe for usage. After the saponification process is complete, the pH should be a base.The process of formation of carboxylic salt and water by hydrolysis of ester in base is called saponification.
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Why is the vapor pressure of a warm lake higher than the vapor pressure of a cold lake?
Answer:
Explanation:
Warm lake vapor pressure is higher than cold lake vapor pressure because it evaporates more quickly. In other words, as the temperature of warm water increases, the kinetic energy of the warm water molecule also increases. As the kinetic energy of the warm water molecule increases, the number of molecules conversion into a vapor also increases, thereby increasing the vapor pressure of warm water.
Answer:
B.
Warm water evaporates more quickly.
Explanation:
i got it right on edmentum!!
What is the mass of 4. 00 moles of helium, the gas commonly used to fill party balloons and lighter-than-air ships?
Enough of a monoprotic acid is dissolved in water to produce a 1. 50 m solution. the ph of the resulting solution is 2. 83. calculate the ka for the acid
1.4406 × 10⁻⁶ is the Ka(dissociation constant) for the acid.
The equilibrium constant for the reaction of an acid with water is the acid dissociation constant, where the acid, HA separates into H⁺ and A⁻ ions.
The acid dissociation constant is represented by (Ka).
So let's first imagine that the given monoprotic acid is HA.
HA will dissociate into H⁺ and A⁻ ions.
HA ⇒ H⁺ and A⁻
The formula used for Ka is
Ka = [H⁺] [A⁻] / [HA]
Given
pH = 2.83
[HA] = 1.50 M
From the given pH, we can calculate [H⁺] and [A⁻]
[H⁺] = [A⁻] = 1 × [tex]10^{-2.83}[/tex] = 1.47 × 10⁻³ M
Ka = 1.47 × 10⁻³ × 1.47 × 10⁻³ / 1.50
Ka = 1.4406 × 10⁻⁶
Hence, 1.4406 × 10⁻⁶ is the Ka for the acid.
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Finding mole ratios from chemical formulae
This is the chemical formula for nickel tetracarbonyl (a powerfully poisonous liquid used in nickel refining):
Ni(CO)4
A chemical engineer has determined by measurements that there are 93. moles of carbon in a sample of nickel tetracarbonyl. How many moles of oxygen are in
the sample?
Round your answer to 2 significant digits.
7 moles of oxygen are in the sample.
According to the chemical formula, each mole of nickel tetracarbonyl contains 4 moles of C atoms. Simply convert it into a fraction by putting the original solution in the denominator and the diluted solution in the numerator if you need to determine the concentration ratio between two solutions. The V/n ratio for each gas must be the same if the two gases are at the same temperature and pressure. The volume ratio of two gases at the same temperature and pressure is equal to their molar ratio. The mole ratio of C to O is 1 : 1
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Why is the vapor pressure of a warm pale higher than the vapor pressure of a cold lake
The vapor pressure of a warm pale higher than the vapor pressure of a cold lake because Warm water evaporates more quickly.
Hence, Option B is correct answer.
What is Evaporation ?The process in which a liquid or solid is converted into vapour is called Evaporation. When water gains the heat energy then it changes in to gas. When the temperature increases it speeds up the rate of evaporation.
The temperature of warm water increases, the kinetic energy of the warm water molecule also increases.
Thus from the above conclusion we can say that The vapour pressure of a warm lake is higher than the vapor pressure of a cold lake because Warm water evaporates more quickly.
Hence, Option B is correct answer.
Disclaimer: The question was given incomplete on the portal. Here is the complete questions.
Question: Why is the vapor pressure of a warm lake higher than the vapor pressure of a cold lake?
A. Warm water has a greater heat of vaporization.
B. Warm water evaporates more quickly.
C. Cool water evaporates more quickly.
D. Cool water has a greater heat of vaporization.
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Starting with the partially balanced equation, ch3cooh(l) ?o2(g)→2co2(g) 2h2o(l) what coefficient should be placed in front of o2 to balance the oxygen atoms?
The coefficient that should be placed in front of O₂ to balance the oxygen atoms is 2.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
The given equation is
CH₃COOH (l) + O₂ → 2CO₂ (g) + 2H₂O(l).
Reactant Side Product Side
C = 2 C = 2
H = 4 H = 4
O = 4 O = 6
The number of atoms of O in the reactant side is 4 and the number of atoms of O in the product side is 6. So multiply by 2 to balance the oxygen atoms.
CH₃COOH (l) + 2O₂ → 2CO₂ (g) + 2H₂O(l).
Reactant Side Product Side
C = 2 C = 2
H = 4 H = 4
O = 6 O = 6
Now the given equation is balanced the number of atoms in reactant side is equal to the number of atoms in the product side.
Thus from the above conclusion we can say that The coefficient that should be placed in front of O₂ to balance the oxygen atoms is 2.
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What can happen if the level of the developing liquid is higher than the applied spots in the tlc analysis?
If the solvent level in the developing jar is deeper than the origin (spotting line) of the TLC plate, the solvent will dissolve the compounds into the solvent reservoir instead of allowing them to move up the plate by capillary action. Thus, you will not see spots after the plate is developed.
What is Thin Layer Chromatography (TLC)?
TLC is a simple, quick, and inexpensive procedure that gives the chemist a quick answer as to how many components are in a mixture. TLC is also used to support the identity of a compound in a mixture when the Rf of a compound is compared with the Rf of a known compound.A TLC plate is a sheet of glass, metal, or plastic which is coated with a thin layer of a solid adsorbent (usually silica or alumina). A small amount of the mixture to be analysed is spotted near the bottom of this plate. The TLC plate is then placed in a shallow pool of a solvent in a developing chamber so that only the very bottom of the plate is in the liquid. This liquid, or the eluent, is the mobile phase, and it slowly rises up the TLC plate by capillary action.As the solvent moves past the spot that was applied, an equilibrium is established for each component of the mixture between the molecules of that component which are adsorbed on the solid and the molecules which are in solution. In principle, the components will differ in solubility and in the strength of their adsorption to the adsorbent and some components will be carried farther up the plate than others. When the solvent has reached the top of the plate, the plate is removed from the developing chamber, dried, and the separated components of the mixture are visualized. If the compounds are coloured, visualization is straightforward. Usually the compounds are not coloured, so a UV lamp is used to visualize the plates. The plate itself contains a fluorescent dye which glows everywhere except where an organic compound is on the plate.To learn more about TLC: https://brainly.com/question/13483325
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How much ice in grams would have to melt to lower the temperature of 356 mL of water from 35 ∘C to 0 ∘C ? (Assume that the density of water is 1.0 g/mL .)
Answer:
156.16 gm of ice
Explanation:
I will assume the ice starts at 0 C
As the ice melts, it produces water at 0 C so we do not need to calculate THAT water being cooled....only the 356 ml being cooled to 0 C
356 gm * 4.186 j/gm-c * (35 c) = 52157.56 j
this is the heat absorbed by the melting ice
x gm * 334 j / gm = 52157.56 j (334 j/gm is heat of fusion of water)
x = 156.16 gm of ice required
A 8.5-liter sample of a gas has 1.2 mole of the gas. if 0.65 mole of the gas is added, what is the final volume of the gas? temperature and pressure remain constant. 13 liters 14 liters 18 liters 21 liters
13 liters is the correct answer
13 liters is the final volume of the gas when the temperature and pressure remain constant.
v1/n1 = v2/n2
where,
v1 = initial volume = 8.5 liter
n1= initial mole of gas = 1.2 mole
n2= final mole of gas = 1.2+0.65= 1.85 mole
v2= final volume = ?
8.5 L/1.2 mol = v2/1.85 mol
7 L x 1.85 mol = v2/1.85 mol x 1.85 mol
13 L = v2
v2= 13 liter
What is a mole?A mole is an SI unit used to measure significant numbers of subatomic particles, such as atoms, molecules, or smaller particles. Any substance has an Avogadro number of molecules in a mole. The value of the Avogadro number is 6.02214076 × [tex]10^{23}[/tex].How much is a mole of gas?
22.4 L
At STP (Standard Temperature and Pressure = 0 °C, 1 atm), an ideal gas has a volume of 22.41 L/mol.
What makes something a mole?Chemists use the term "mole" because atoms, molecules, and other particles are all very small and require a large amount to even weigh them. A mole is a measurement of the number of particles present, not their mass.To learn more about mole of gas visit:
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