Question 1

A change in the temperature can change the value of the equilibrium constant.

Accepted Answer

A) True 
 B)False

Question 2

If Q<K then less reactants are observed as the reaction proceeds to ___________.

Accepted Answer

The answer of If Q<K then less reactants are observed...

Question 3

At 340.K,KP = 69 for the reaction H2(g)+ I2(g)   2HI(g).Suppose 50.0 g of HI is injected into an evacuated 5.00-L rigid cylinder at 340.K.What is the total pressure inside the cylinder when the system comes to equilibrium?

Accepted Answer

A) 2.60 atm 
B) 1.76 atm 
C) 0.424 atm 
D) 2.18 atm 
E) 0.171 atm 
A) 2.60 atm 
B) 1.76 atm 
C) 0.424 atm 
D) 2.18 atm 
E) 0.171 atm

Question 4

For the reaction HCONH2(g)   NH3(g)+ CO(g),Kc = 4.84 at 400 K.If ΔH° for this reaction is 29 kJ/mol,find Kc at 500 K.

Accepted Answer

A) 5.8 
B) 0.17 
C) 27.5 
D) 0.88 
E) 10.3 
A) 5.8 
B) 0.17 
C) 27.5 
D) 0.88 
E) 10.3

Question 5

At 35ºC,the equilibrium constant for the reaction 2NOCl(g)   2NO(g)+ Cl2(g)is Kc = 1.6×10-5.An equilibrium mixture was found to have the following concentrations of Cl2 and NOCl: [Cl2] = 1.2 × 10-2 M; [NOCl] = 2.8 ×10-1 M.Calculate the concentration of NO(g)at equilibrium.

Accepted Answer

A) 1.0 × 10-4 M 
B) 1.0 × 10-2 M 
C) 2.8 × 10-1 M 
D) 2.4 × 10-2 M 
E) 1.6 × 10-3 M 
A) 1.0 × 10-4 M 
B) 1.0 × 10-2 M 
C) 2.8 × 10-1 M 
D) 2.4 × 10-2 M 
E) 1.6 × 10-3 M

Question 6

For the following reaction at equilibrium,which one of the changes below would cause the equilibrium to shift to the left? 2NOBr(g)   2NO(g)+ Br2(g),ΔHºrxn = 30 kJ/mol

Accepted Answer

A) Increase the container volume 
B) Remove some NO 
C) Remove some Br2 
D) Add more NOBr 
E) Decrease the temperature 
A) Increase the container volume 
B) Remove some NO 
C) Remove some Br2 
D) Add more NOBr 
E) Decrease the temperature

Question 7

For the nitrogen fixation reaction,3H2(g)+ N2(g)   2NH3(g),Kc = 6.0 × 10-2 at 500°C.If 0.250 M H2 and 0.050 M NH3 are present at equilibrium,what is the equilibrium concentration of N2?

Accepted Answer

A) 3.3 M 
B) 2.7 M 
C) 0.20 M 
D) 0.083 M 
E) 0.058 M 
A) 3.3 M 
B) 2.7 M 
C) 0.20 M 
D) 0.083 M 
E) 0.058 M

Question 8

A 6.0-L vessel was found to contain 1.0 mol BrCl3,2.0 mol Br2 and 6.0 mol Cl2. What is the equilibrium constant,Kc,for this equilibrium mixture for the reaction
2BrCl3(g)   Br2(g)+ 3Cl2(g)?

Accepted Answer

A) 0.014 
B) 108 
C) 18 
D) 12 
E) 432 
A) 0.014 
B) 108 
C) 18 
D) 12 
E) 432

Question 9

The equilibrium constant,KP,for the reaction H2(g)+ I2(g)   2HI(g)is 55.2 at 425°C.A rigid cylinder at that temperature contains 0.127
Atm of hydrogen,0.134 atm of iodine,and 1.055 atm of hydrogen iodide.Is the system at equilibrium?

Accepted Answer

A) Yes. 
B) No,the forward reaction must proceed to establish equilibrium. 
C) No,the reverse reaction must proceed to establish equilibrium. 
D) I need to know the volume of the container before deciding. 
E) Need to know the starting pressures of all substances before deciding. 
A) Yes. 
B) No,the forward reaction must proceed to establish equilibrium. 
C) No,the reverse reaction must proceed to establish equilibrium. 
D) I need to know the volume of the container before deciding. 
E) Need to know the starting pressures of all substances before deciding.

Question 10

At 25°C,the equilibrium constant,Kc,for the reaction 2A(g)   B(g)+ C(g)is 0.0350.
A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0-L container is allowed to come to equilibrium.What is the equilibrium concentration of A?

Accepted Answer

A) 0.339 M 
B) 0.378 M 
C) 0.400 M 
D) 0.677 M 
E) 0.755 M 
A) 0.339 M 
B) 0.378 M 
C) 0.400 M 
D) 0.677 M 
E) 0.755 M

Question 11

What is the expression for the partial pressure of "A" for the following reaction under ideal conditions? A(g)   B(g)

Accepted Answer

A) PA = nART 
B) PA = (nA/V)RT 
C) PA = V/nA 
D) PA = VRT 
E) PA = (V/n
A) RT 
A) PA = nART 
B) PA = (nA/V)RT 
C) PA = V/nA 
D) PA = VRT 
E) PA = (V/n
A) RT

Question 12

Consider the reaction: 2A(g)+ B(g)→ 2C(g) If ΔG° = 50.0 kJ/mol at T = 25°C and PA = PB = 1 atm and PC = 2 atm,what is the value of
ΔG? (R = 8.314 J/K • mol)

Accepted Answer

A) 50.0 kJ/mol 
B) 49.7 kJ/mol 
C) 46.5 kJ/mol 
D) 53.4 kJ/mol 
E) -49.7 kJ/mol 
A) 50.0 kJ/mol 
B) 49.7 kJ/mol 
C) 46.5 kJ/mol 
D) 53.4 kJ/mol 
E) -49.7 kJ/mol

Question 13

Equilibrium constants are known for the following reactions:
S(s)+ (3/2)O2(g)   SO3(g)Kc = 9.2 × 1023 SO3(g)   SO2(g)+ (1/2)O2(g)Kc = 4.8 × 10-4 Thus,for the reaction S(s)+ O2(g)   SO2(g),Kc = 4.4 × 1020.

Accepted Answer

A) True 
 B)False

Question 14

The formation constant for the reaction Ag+(aq)+ 2NH3(aq)   Ag(NH3)2+(aq)
Is Kf = 1.7 × 107 at 25°C.What is ΔG° at this temperature? (R = 8.314 J/K• mol)

Accepted Answer

A) -1.5 kJ/mol 
B) -3.5 kJ/mol 
C) -18 kJ/mol 
D) -23 kJ/mol 
E) -41 kJ/mol 
A) -1.5 kJ/mol 
B) -3.5 kJ/mol 
C) -18 kJ/mol 
D) -23 kJ/mol 
E) -41 kJ/mol

Question 15

Consider the following reactions and their associated equilibrium constants: A + 2B   C K1
C   D + E K2
For the reaction A + 2B   D + E,having equilibrium constant Kc,

Accepted Answer

A) Kc = K1 + K2. 
B) Kc = K1/K2. 
C) Kc = K1 - K2. 
D) Kc = (K1)(K2). 
E) Kc = K2/K1. 
A) Kc = K1 + K2. 
B) Kc = K1/K2. 
C) Kc = K1 - K2. 
D) Kc = (K1)(K2). 
E) Kc = K2/K1.

A change in the temperature can change the value of the equilibrium constant.

If Q<K then less reactants are observed as the reaction proceeds to ___________.

At 340.K,K_P = 69 for the reaction H₂(g)+ I₂(g) 2HI(g).Suppose 50.0 g of HI is injected into an evacuated 5.00-L rigid cylinder at 340.K.What is the total pressure inside the cylinder when the system comes to equilibrium?

For the reaction HCONH₂(g) NH₃(g)+ CO(g),K_c = 4.84 at 400 K.If ΔH° for this reaction is 29 kJ/mol,find K_c at 500 K.

At 35ºC,the equilibrium constant for the reaction 2NOCl(g) 2NO(g)+ Cl₂(g)is K_c = 1.6×10^-5.An equilibrium mixture was found to have the following concentrations of Cl² and NOCl: [Cl₂] = 1.2 × 10^-2 M; [NOCl] = 2.8 ×10^-1 M.Calculate the concentration of NO(g)at equilibrium.

For the following reaction at equilibrium,which one of the changes below would cause the equilibrium to shift to the left? 2NOBr(g) 2NO(g)+ Br₂(g),ΔHº_rxn = 30 kJ/mol

For the nitrogen fixation reaction,3H₂(g)+ N₂(g) 2NH₃(g),K_c = 6.0 × 10^-2 at 500°C.If 0.250 M H₂ and 0.050 M NH₃ are present at equilibrium,what is the equilibrium concentration of N₂?

A 6.0-L vessel was found to contain 1.0 mol BrCl₃,2.0 mol Br₂ and 6.0 mol Cl₂. What is the equilibrium constant,K_c,for this equilibrium mixture for the reaction 2BrCl₃(g) Br₂(g)+ 3Cl₂(g)?

The equilibrium constant,K_P,for the reaction H₂(g)+ I₂(g) 2HI(g)is 55.2 at 425°C.A rigid cylinder at that temperature contains 0.127 Atm of hydrogen,0.134 atm of iodine,and 1.055 atm of hydrogen iodide.Is the system at equilibrium?

At 25°C,the equilibrium constant,K_c,for the reaction 2A(g) B(g)+ C(g)is 0.0350. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0-L container is allowed to come to equilibrium.What is the equilibrium concentration of A?

What is the expression for the partial pressure of "A" for the following reaction under ideal conditions? A(g) B(g)

Consider the reaction: 2A(g)+ B(g)→ 2C(g) If ΔG° = 50.0 kJ/mol at T = 25°C and P_A = P_B = 1 atm and P_C = 2 atm,what is the value of ΔG? (R = 8.314 J/K • mol)

Equilibrium constants are known for the following reactions: S(s)+ (3/2)O2(g) SO₃(g)K_c = 9.2 × 10²³ SO₃(g) SO₂(g)+ (1/2)O₂(g)K_c = 4.8 × 10^-4 Thus,for the reaction S(s)+ O₂(g) SO₂(g),K_c = 4.4 × 10²⁰.

The formation constant for the reaction Ag⁺(aq)+ 2NH₃(aq) Ag(NH₃)₂⁺(aq) Is K_f = 1.7 × 10⁷ at 25°C.What is ΔG° at this temperature? (R = 8.314 J/K• mol)

Consider the following reactions and their associated equilibrium constants: A + 2B C K₁ C D + E K₂ For the reaction A + 2B D + E,having equilibrium constant K_c,

Chemistry: the Central Science

Atoms Molecules and Ions

Stoichiometry Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I Basic Concepts

Chemical Bonding Ii Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

Exam 15: Chemical Equilibrium

A change in the temperature can change the value of the equilibrium constant.

If Q<K then less reactants are observed as the reaction proceeds to ___________.

At 340.K,KP = 69 for the reaction H2(g)+ I2(g) 2HI(g).Suppose 50.0 g of HI is injected into an evacuated 5.00-L rigid cylinder at 340.K.What is the total pressure inside the cylinder when the system comes to equilibrium?

For the reaction HCONH2(g) NH3(g)+ CO(g),Kc = 4.84 at 400 K.If ΔH° for this reaction is 29 kJ/mol,find Kc at 500 K.

At 35ºC,the equilibrium constant for the reaction 2NOCl(g) 2NO(g)+ Cl2(g)is Kc = 1.6×10-5.An equilibrium mixture was found to have the following concentrations of Cl2 and NOCl: [Cl2] = 1.2 × 10-2 M; [NOCl] = 2.8 ×10-1 M.Calculate the concentration of NO(g)at equilibrium.

For the following reaction at equilibrium,which one of the changes below would cause the equilibrium to shift to the left? 2NOBr(g) 2NO(g)+ Br2(g),ΔHºrxn = 30 kJ/mol

For the nitrogen fixation reaction,3H2(g)+ N2(g) 2NH3(g),Kc = 6.0 × 10-2 at 500°C.If 0.250 M H2 and 0.050 M NH3 are present at equilibrium,what is the equilibrium concentration of N2?

A 6.0-L vessel was found to contain 1.0 mol BrCl3,2.0 mol Br2 and 6.0 mol Cl2. What is the equilibrium constant,Kc,for this equilibrium mixture for the reaction 2BrCl3(g) Br2(g)+ 3Cl2(g)?

The equilibrium constant,KP,for the reaction H2(g)+ I2(g) 2HI(g)is 55.2 at 425°C.A rigid cylinder at that temperature contains 0.127 Atm of hydrogen,0.134 atm of iodine,and 1.055 atm of hydrogen iodide.Is the system at equilibrium?

At 25°C,the equilibrium constant,Kc,for the reaction 2A(g) B(g)+ C(g)is 0.0350. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0-L container is allowed to come to equilibrium.What is the equilibrium concentration of A?

What is the expression for the partial pressure of "A" for the following reaction under ideal conditions? A(g) B(g)

Consider the reaction: 2A(g)+ B(g)→ 2C(g) If ΔG° = 50.0 kJ/mol at T = 25°C and PA = PB = 1 atm and PC = 2 atm,what is the value of ΔG? (R = 8.314 J/K • mol)

Equilibrium constants are known for the following reactions: S(s)+ (3/2)O2(g) SO3(g)Kc = 9.2 × 1023 SO3(g) SO2(g)+ (1/2)O2(g)Kc = 4.8 × 10-4 Thus,for the reaction S(s)+ O2(g) SO2(g),Kc = 4.4 × 1020.

The formation constant for the reaction Ag+(aq)+ 2NH3(aq) Ag(NH3)2+(aq) Is Kf = 1.7 × 107 at 25°C.What is ΔG° at this temperature? (R = 8.314 J/K• mol)

Consider the following reactions and their associated equilibrium constants: A + 2B C K1 C D + E K2 For the reaction A + 2B D + E,having equilibrium constant Kc,

Chemistry: the Central Science

Atoms Molecules and Ions

Stoichiometry Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I Basic Concepts

Chemical Bonding Ii Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

At 340.K,K_P = 69 for the reaction H₂(g)+ I₂(g) 2HI(g).Suppose 50.0 g of HI is injected into an evacuated 5.00-L rigid cylinder at 340.K.What is the total pressure inside the cylinder when the system comes to equilibrium?

For the reaction HCONH₂(g) NH₃(g)+ CO(g),K_c = 4.84 at 400 K.If ΔH° for this reaction is 29 kJ/mol,find K_c at 500 K.

At 35ºC,the equilibrium constant for the reaction 2NOCl(g) 2NO(g)+ Cl₂(g)is K_c = 1.6×10^-5.An equilibrium mixture was found to have the following concentrations of Cl² and NOCl: [Cl₂] = 1.2 × 10^-2 M; [NOCl] = 2.8 ×10^-1 M.Calculate the concentration of NO(g)at equilibrium.

For the following reaction at equilibrium,which one of the changes below would cause the equilibrium to shift to the left? 2NOBr(g) 2NO(g)+ Br₂(g),ΔHº_rxn = 30 kJ/mol

For the nitrogen fixation reaction,3H₂(g)+ N₂(g) 2NH₃(g),K_c = 6.0 × 10^-2 at 500°C.If 0.250 M H₂ and 0.050 M NH₃ are present at equilibrium,what is the equilibrium concentration of N₂?

A 6.0-L vessel was found to contain 1.0 mol BrCl₃,2.0 mol Br₂ and 6.0 mol Cl₂. What is the equilibrium constant,K_c,for this equilibrium mixture for the reaction 2BrCl₃(g) Br₂(g)+ 3Cl₂(g)?

The equilibrium constant,K_P,for the reaction H₂(g)+ I₂(g) 2HI(g)is 55.2 at 425°C.A rigid cylinder at that temperature contains 0.127 Atm of hydrogen,0.134 atm of iodine,and 1.055 atm of hydrogen iodide.Is the system at equilibrium?

At 25°C,the equilibrium constant,K_c,for the reaction 2A(g) B(g)+ C(g)is 0.0350. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0-L container is allowed to come to equilibrium.What is the equilibrium concentration of A?

Consider the reaction: 2A(g)+ B(g)→ 2C(g) If ΔG° = 50.0 kJ/mol at T = 25°C and P_A = P_B = 1 atm and P_C = 2 atm,what is the value of ΔG? (R = 8.314 J/K • mol)

Equilibrium constants are known for the following reactions: S(s)+ (3/2)O2(g) SO₃(g)K_c = 9.2 × 10²³ SO₃(g) SO₂(g)+ (1/2)O₂(g)K_c = 4.8 × 10^-4 Thus,for the reaction S(s)+ O₂(g) SO₂(g),K_c = 4.4 × 10²⁰.

The formation constant for the reaction Ag⁺(aq)+ 2NH₃(aq) Ag(NH₃)₂⁺(aq) Is K_f = 1.7 × 10⁷ at 25°C.What is ΔG° at this temperature? (R = 8.314 J/K• mol)

Consider the following reactions and their associated equilibrium constants: A + 2B C K₁ C D + E K₂ For the reaction A + 2B D + E,having equilibrium constant K_c,