A mixture of carbon monoxide,hydrogen,and methanol is at equilibrium.The balanced chemical equation is: CO(g)+ 2H2(g)⇌ CH3OH(g).At 250°C,the mixture contains 0.0960 M CO,0.191 M H2,and 0.150 M CH3OH.What is the value for Kc?

A) 2)33 × 10-2 B) 0)244 C) 4)09 D) 42.8 A) 2)33 × 10-2 B) 0)244 C) 4)09 D) 42.8

At a certain temperature,Kc equals 1.4 × 102 for the reaction: 2 CO(g)+ O2(g)⇌ 2 CO2(g). If a 3.00-L flask contains 0.400 mol of CO2 and 0.100 mol of O2 at equilibrium,how many moles of CO are also present in the flask?

A) 0)555 mol B) 0)185 mol C) 0)107 mol D) 0)0114 mol A) 0)555 mol B) 0)185 mol C) 0)107 mol D) 0)0114 mol

The following pictures represent the initial state and the equilibrium state for the gaseous state reaction of AS1U1B12S1U1B0 molecules (shaded spheres)with B atoms (unshaded spheres)to give AB molecules. -What is the best balanced chemical equation for the reaction?

A) A2 + B ⇌ A2B B) A2 + 2 B ⇌ A2B2 C) A2 + 2 B ⇌ 2 AB D) 6 A2 + 9 B ⇌ 3 A2 + 3B + 6 AB A) A2 + B ⇌ A2B B) A2 + 2 B ⇌ A2B2 C) A2 + 2 B ⇌ 2 AB D) 6 A2 + 9 B ⇌ 3 A2 + 3B + 6 AB

If Kc = 7.04 × 10-2 for the reaction: 2 HBr(g)⇌ H2(g)+ Br2(g),what is the value of Kc for the reaction: 1/2 H2(g)+ 1/2 Br2(g)== HBr(g)?

A) 3)52 × 10-2 B) 0)265 C) 3)77 D) 28.4 A) 3)52 × 10-2 B) 0)265 C) 3)77 D) 28.4

Kp is equal to 48.70 at 731 K for the reaction: H2(g)+ I2(g)⇌ 2 HI(g).Initially the mixture contains 0.08592 atm each of H2 and I2 and 1.0000 atm of HI.What is the pressure of HI at equilibrium?

A) 0)7955 atm B) 0)9108 atm C) 0)9140 atm D) 0)9498 atm A) 0)7955 atm B) 0)9108 atm C) 0)9140 atm D) 0)9498 atm

The decomposition of ammonia is: 2 NH3(g)⇌ N2(g)+ 3 H2(g).If the partial pressure of ammonia is 1.6 × 10-3 atm and the partial pressures of N2 and H2 are each 0.25 atm at equilibrium,what is the value for Kc at 400°C for the forward reaction?

A) 0)50 B) 1)4 C) 1)5 × 103 D) 4)6 × 106 A) 0)50 B) 1)4 C) 1)5 × 103 D) 4)6 × 106

The reaction AS1U1B12S1U1B0 + BS1U1B12 S1U1B0⇌ 2AB has an equilibrium constant KS1U1B1cS1U1B0 = 1.8.The following pictures represent reaction mixtures that contain AS1U1B12S1U1B0 molecules (shaded)and BS1U1B12S1U1B0 molecules (unshaded),and AB molecules. -Which nonequilibrium mixture will react in the forward direction to reach equilibrium?

A) reaction mixture (1) B) reaction mixture (2) C) reaction mixture (3) D) reaction mixture (4) A) reaction mixture (1) B) reaction mixture (2) C) reaction mixture (3) D) reaction mixture (4)

Iron oxide ores are reduced to iron metal by exothermic reaction with carbon monoxide: FeO(s)+ CO(g)⇌ Fe(s)+ CO2(g) Which of the following changes in condition will cause the equilibrium to shift to the right?

A) add FeO B) add CO C) add CO2 D) raise the temperature A) add FeO B) add CO C) add CO2 D) raise the temperature

Exam 13: Chemical Equilibrium

A mixture of carbon monoxide,hydrogen,and methanol is at equilibrium.The balanced chemical equation is: CO(g)+ 2H₂(g)⇌ CH₃OH(g).At 250°C,the mixture contains 0.0960 M CO,0.191 M H₂,and 0.150 M CH₃OH.What is the value for K_c?

(Multiple Choice)

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Question 121

At a certain temperature,K_c equals 1.4 × 10² for the reaction: 2 CO(g)+ O₂(g)⇌ 2 CO₂(g). If a 3.00-L flask contains 0.400 mol of CO₂ and 0.100 mol of O₂ at equilibrium,how many moles of CO are also present in the flask?

(Multiple Choice)

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Question 122

The following pictures represent the initial state and the equilibrium state for the gaseous state reaction of A₂ molecules (shaded spheres)with B atoms (unshaded spheres)to give AB molecules. -What is the best balanced chemical equation for the reaction?

(Multiple Choice)

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Question 123

Which of the following statements about a catalyst is true?

(Multiple Choice)

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Question 124

The following picture represents the equilibrium state for the reaction A₂ + B₂ ⇌ 2AB.What is the relationship between the rate constant for the forward reaction,k_f,and the rate constant for the reverse reaction k_r?

(Multiple Choice)

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Question 125

"If a stress is applied to a reaction mixture at equilibrium,the reaction occurs in the direction that will relieve the stress." This statement is called

(Multiple Choice)

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Question 126

When baking soda is heated it decomposes according to the following reaction: 2 NaHCO₃(s)⇌ Na₂CO₃(s)+ H₂O(g)+ CO₂(g) If sufficient baking soda is placed in a container and heated to 90°C,the total pressure of the gases is 0.5451 atm.What is the value of K_p at that temperature?

(Multiple Choice)

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Question 127

If K_c = 7.04 × 10^-2 for the reaction: 2 HBr(g)⇌ H₂(g)+ Br₂(g),what is the value of K_c for the reaction: 1/2 H₂(g)+ 1/2 Br₂(g)== HBr(g)?

(Multiple Choice)

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Question 128

Given the hypothetical reaction: 2 A(s)+ x B(g)⇌ 3 C(g),K_p = 0.0105 and K_c = 0.45 at 250°C.What is the value of the coefficient x?

(Multiple Choice)

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Question 129

K_p is equal to 48.70 at 731 K for the reaction: H₂(g)+ I₂(g)⇌ 2 HI(g).Initially the mixture contains 0.08592 atm each of H₂ and I₂ and 1.0000 atm of HI.What is the pressure of HI at equilibrium?

(Multiple Choice)

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Question 130

Picture (1)represents the equilibrium mixture for the gas-phase reaction A + B ⇌ 2 AB at 298 K.If the volume of the equilibrium mixture is decreased,which picture (2)-(4)represents the equilibrium at the reduced volume?

(Multiple Choice)

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Question 131

The decomposition of ammonia is: 2 NH₃(g)⇌ N₂(g)+ 3 H₂(g).If the partial pressure of ammonia is 1.6 × 10^-3 atm and the partial pressures of N₂ and H₂ are each 0.25 atm at equilibrium,what is the value for K_c at 400°C for the forward reaction?

(Multiple Choice)

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Question 132

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is

(Multiple Choice)

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Question 133

The reaction A₂ + B₂⇌ 2AB has an equilibrium constant K_c = 1.8.The following pictures represent reaction mixtures that contain A₂ molecules (shaded)and B₂ molecules (unshaded),and AB molecules. -Which nonequilibrium mixture will react in the forward direction to reach equilibrium?

(Multiple Choice)

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Question 134

Which of the following statements is false regarding the equilibrium constant,K_c?

(Multiple Choice)

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Question 135

Iron oxide ores are reduced to iron metal by exothermic reaction with carbon monoxide: FeO(s)+ CO(g)⇌ Fe(s)+ CO₂(g) Which of the following changes in condition will cause the equilibrium to shift to the right?

(Multiple Choice)

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Question 136

Which will not alter the composition of an equilibrium mixture?

(Multiple Choice)

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Question 137

For the reaction CaCO₃(s)⇌ CaO(s)+ O₂(g)the equilibrium expression is K_p = ________.

(Short Answer)

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Question 138

Salt solubilities can be compared by the concentration of cation formed when the salt dissolves in the general reaction: M_aX_b(s)⇌ a M^b+(aq)+ b X^a-(aq).Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

(Multiple Choice)

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Question 139

For the reaction shown below,which change in conditions made to the system at equilibrium will result in a net reaction to the right to form more product? C(s)+ 2 H₂(g)⇌ CH₄(g)ΔH° = -74.8 kJ

(Multiple Choice)

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Question 140

Showing 121 - 140 of 166

Exam 13: Chemical Equilibrium

A mixture of carbon monoxide,hydrogen,and methanol is at equilibrium.The balanced chemical equation is: CO(g)+ 2H2(g)⇌ CH3OH(g).At 250°C,the mixture contains 0.0960 M CO,0.191 M H2,and 0.150 M CH3OH.What is the value for Kc?

At a certain temperature,Kc equals 1.4 × 102 for the reaction: 2 CO(g)+ O2(g)⇌ 2 CO2(g). If a 3.00-L flask contains 0.400 mol of CO2 and 0.100 mol of O2 at equilibrium,how many moles of CO are also present in the flask?

The following pictures represent the initial state and the equilibrium state for the gaseous state reaction of A2 molecules (shaded spheres)with B atoms (unshaded spheres)to give AB molecules. -What is the best balanced chemical equation for the reaction?

Which of the following statements about a catalyst is true?

The following picture represents the equilibrium state for the reaction A2 + B2 ⇌ 2AB.What is the relationship between the rate constant for the forward reaction,kf,and the rate constant for the reverse reaction kr?

"If a stress is applied to a reaction mixture at equilibrium,the reaction occurs in the direction that will relieve the stress." This statement is called

When baking soda is heated it decomposes according to the following reaction: 2 NaHCO3(s)⇌ Na2CO3(s)+ H2O(g)+ CO2(g) If sufficient baking soda is placed in a container and heated to 90°C,the total pressure of the gases is 0.5451 atm.What is the value of Kp at that temperature?

If Kc = 7.04 × 10-2 for the reaction: 2 HBr(g)⇌ H2(g)+ Br2(g),what is the value of Kc for the reaction: 1/2 H2(g)+ 1/2 Br2(g)== HBr(g)?

Given the hypothetical reaction: 2 A(s)+ x B(g)⇌ 3 C(g),Kp = 0.0105 and Kc = 0.45 at 250°C.What is the value of the coefficient x?

Kp is equal to 48.70 at 731 K for the reaction: H2(g)+ I2(g)⇌ 2 HI(g).Initially the mixture contains 0.08592 atm each of H2 and I2 and 1.0000 atm of HI.What is the pressure of HI at equilibrium?

Picture (1)represents the equilibrium mixture for the gas-phase reaction A + B ⇌ 2 AB at 298 K.If the volume of the equilibrium mixture is decreased,which picture (2)-(4)represents the equilibrium at the reduced volume?

The decomposition of ammonia is: 2 NH3(g)⇌ N2(g)+ 3 H2(g).If the partial pressure of ammonia is 1.6 × 10-3 atm and the partial pressures of N2 and H2 are each 0.25 atm at equilibrium,what is the value for Kc at 400°C for the forward reaction?

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is

The reaction A2 + B2 ⇌ 2AB has an equilibrium constant Kc = 1.8.The following pictures represent reaction mixtures that contain A2 molecules (shaded)and B2 molecules (unshaded),and AB molecules. -Which nonequilibrium mixture will react in the forward direction to reach equilibrium?

Which of the following statements is false regarding the equilibrium constant,Kc?

Iron oxide ores are reduced to iron metal by exothermic reaction with carbon monoxide: FeO(s)+ CO(g)⇌ Fe(s)+ CO2(g) Which of the following changes in condition will cause the equilibrium to shift to the right?

Which will not alter the composition of an equilibrium mixture?

For the reaction CaCO3(s)⇌ CaO(s)+ O2(g)the equilibrium expression is Kp = ________.

Salt solubilities can be compared by the concentration of cation formed when the salt dissolves in the general reaction: MaXb(s)⇌ a Mb+(aq)+ b Xa-(aq).Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

For the reaction shown below,which change in conditions made to the system at equilibrium will result in a net reaction to the right to form more product? C(s)+ 2 H2(g)⇌ CH4(g)ΔH° = -74.8 kJ

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A mixture of carbon monoxide,hydrogen,and methanol is at equilibrium.The balanced chemical equation is: CO(g)+ 2H₂(g)⇌ CH₃OH(g).At 250°C,the mixture contains 0.0960 M CO,0.191 M H₂,and 0.150 M CH₃OH.What is the value for K_c?

At a certain temperature,K_c equals 1.4 × 10² for the reaction: 2 CO(g)+ O₂(g)⇌ 2 CO₂(g). If a 3.00-L flask contains 0.400 mol of CO₂ and 0.100 mol of O₂ at equilibrium,how many moles of CO are also present in the flask?

The following pictures represent the initial state and the equilibrium state for the gaseous state reaction of A₂ molecules (shaded spheres)with B atoms (unshaded spheres)to give AB molecules. -What is the best balanced chemical equation for the reaction?

The following picture represents the equilibrium state for the reaction A₂ + B₂ ⇌ 2AB.What is the relationship between the rate constant for the forward reaction,k_f,and the rate constant for the reverse reaction k_r?

When baking soda is heated it decomposes according to the following reaction: 2 NaHCO₃(s)⇌ Na₂CO₃(s)+ H₂O(g)+ CO₂(g) If sufficient baking soda is placed in a container and heated to 90°C,the total pressure of the gases is 0.5451 atm.What is the value of K_p at that temperature?

If K_c = 7.04 × 10^-2 for the reaction: 2 HBr(g)⇌ H₂(g)+ Br₂(g),what is the value of K_c for the reaction: 1/2 H₂(g)+ 1/2 Br₂(g)== HBr(g)?

Given the hypothetical reaction: 2 A(s)+ x B(g)⇌ 3 C(g),K_p = 0.0105 and K_c = 0.45 at 250°C.What is the value of the coefficient x?

K_p is equal to 48.70 at 731 K for the reaction: H₂(g)+ I₂(g)⇌ 2 HI(g).Initially the mixture contains 0.08592 atm each of H₂ and I₂ and 1.0000 atm of HI.What is the pressure of HI at equilibrium?

The decomposition of ammonia is: 2 NH₃(g)⇌ N₂(g)+ 3 H₂(g).If the partial pressure of ammonia is 1.6 × 10^-3 atm and the partial pressures of N₂ and H₂ are each 0.25 atm at equilibrium,what is the value for K_c at 400°C for the forward reaction?

The reaction A₂ + B₂⇌ 2AB has an equilibrium constant K_c = 1.8.The following pictures represent reaction mixtures that contain A₂ molecules (shaded)and B₂ molecules (unshaded),and AB molecules. -Which nonequilibrium mixture will react in the forward direction to reach equilibrium?

Which of the following statements is false regarding the equilibrium constant,K_c?

Iron oxide ores are reduced to iron metal by exothermic reaction with carbon monoxide: FeO(s)+ CO(g)⇌ Fe(s)+ CO₂(g) Which of the following changes in condition will cause the equilibrium to shift to the right?

For the reaction CaCO₃(s)⇌ CaO(s)+ O₂(g)the equilibrium expression is K_p = ________.

Salt solubilities can be compared by the concentration of cation formed when the salt dissolves in the general reaction: M_aX_b(s)⇌ a M^b+(aq)+ b X^a-(aq).Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

For the reaction shown below,which change in conditions made to the system at equilibrium will result in a net reaction to the right to form more product? C(s)+ 2 H₂(g)⇌ CH₄(g)ΔH° = -74.8 kJ