Question 1

For the following reaction at equilibrium,which one of the changes below would cause the equilibrium to shift to the left? 2NOBr(g)  2(g) ,ΔHºrxn = 30 kJ/mol A) Increase the container volume B) Remove some NO C) Remove some Br2 D) Add more NOBr E) Decrease the temperature" class="answers-bank-image d-inline" rel="preload" > 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 temperatureF) A) and B)
G) A) and C)

Question 2

For the reaction HCONH2(g)  2(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. A) 5.8 B) 0.17 C) 27.5 D) 0.88 E) 10.3" class="answers-bank-image d-inline" rel="preload" > 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)  10.3F) A) and E)
G) D) and E)

Question 3

The equilibrium constant,KP,for the reaction H2(g) + I2(g)  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? 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." class="answers-bank-image d-inline" rel="preload" > 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.F) B) and D)
G) A) and B)

Question 4

At 35ºC,the equilibrium constant for the reaction 2NOCl(g)  2(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. 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" class="answers-bank-image d-inline" rel="preload" > 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 MF) C) and E)
G) A) and B)

Question 5

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/molF) B) and D)
G) C) and E)

Question 6

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)  3,2.0 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) ? A) 0.014 B) 108 C) 18 D) 12 E) 432" class="answers-bank-image d-inline" rel="preload" > Br2(g) + 3Cl2(g) ?

Accepted Answer

A)  0.014
B)  108
C)  18
D)  12
E)  432F) B) and E)
G) B) and C)

Question 7

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 8

At 25°C,the equilibrium constant,Kc,for the reaction 2A(g)  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? A) 0.339 M B) 0.378 M C) 0.400 M D) 0.677 M E) 0.755 M" class="answers-bank-image d-inline" rel="preload" > 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 MF) B) and E)
G) None of the above

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Consider the following reactions and their associated equilibrium constants: A + 2B 1 C   D + E K2 For the reaction A + 2B   D + E,having equilibrium constant Kc, A) Kc = K1 + K2. B) Kc = K1/K2. C) Kc = K1 - K2. D) Kc = (K1) (K2) . E) Kc = K2/K1." class="answers-bank-image d-inline" rel="preload" > C K1
C 1 C   D + E K2 For the reaction A + 2B   D + E,having equilibrium constant Kc, A) Kc = K1 + K2. B) Kc = K1/K2. C) Kc = K1 - K2. D) Kc = (K1) (K2) . E) Kc = K2/K1." class="answers-bank-image d-inline" rel="preload" > D + E K2
For the reaction A + 2B 1 C   D + E K2 For the reaction A + 2B   D + E,having equilibrium constant Kc, A) Kc = K1 + K2. B) Kc = K1/K2. C) Kc = K1 - K2. D) Kc = (K1) (K2) . E) Kc = K2/K1." class="answers-bank-image d-inline" rel="preload" > 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.F) C) and D)
G) A) and E)

Question 11

At 340.K,KP = 69 for the reaction H2(g) + I2(g)  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? A) 2.60 atm B) 1.76 atm C) 0.424 atm D) 2.18 atm E) 0.171 atm" class="answers-bank-image d-inline" rel="preload" > 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 atmF) None of the above
G) B) and D)

Question 12

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 13

For the nitrogen fixation reaction,3H2(g) + N2(g)  2(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) 3.3 M B) 2.7 M C) 0.20 M D) 0.083 M E) 0.058 M" class="answers-bank-image d-inline" rel="preload" > 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 MF) A) and C)
G) D) and E)

Question 14

The formation constant for the reaction Ag+(aq) + 2NH3(aq)  +(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)  A) -1.5 kJ/mol B) -3.5 kJ/mol C) -18 kJ/mol D) -23 kJ/mol E) -41 kJ/mol" class="answers-bank-image d-inline" rel="preload" > 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/molF) C) and D)
G) A) and B)

Question 15

What is the expression for the partial pressure of "A" for the following reaction under ideal conditions? A(g)  ART B) PA = (nA/V) RT C) PA = V/nA D) PA = VRT E) PA = (V/nA) RT" class="answers-bank-image d-inline" rel="preload" > B(g)

Accepted Answer

A)  PA = nART
B)  PA = (nA/V) RT
C)  PA = V/nA
D)  PA = VRT
E)  PA = (V/n
A)  RTF) None of the above
G) A) and C)

Exam 15: Chemical Equilibrium

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.

Correct Answer
verified

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?

Correct Answer
verified

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,

Correct Answer
verified

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.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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) ?

Correct Answer
verified

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?

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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)

Correct Answer
verified

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.

Correct Answer
verified

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)

Correct Answer
verified

Exam 15: Chemical Equilibrium

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.

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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,

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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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?

Correct AnswerverifiedShow Answer

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) ?

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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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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)

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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.

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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)

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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.

Correct Answer
verified

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?

Correct Answer
verified

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,

Correct Answer
verified

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.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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?

Correct Answer
verified

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) ?

Correct Answer
verified

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?

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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)

Correct Answer
verified

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.

Correct Answer
verified

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)

Correct Answer
verified