On analysis, an equilibrium mixture for the reaction 2H2S(g) 2H2(g)+ S2(g)was found to contain 1.0 mol H2S, 4.0 mol H2, and 0.80 mol S2 in a 4.0 L vessel. Calculate the equilibrium constant, Kc, for this reaction.

A) 1.6 B) 3.2 C) 12.8 D) 0.64 E) 0.8 A) 1.6 B) 3.2 C) 12.8 D) 0.64 E) 0.8

For the reaction SO2(g)+ NO2(g) SO3(g)+ NO(g), the equilibrium constant is 18.0 at 1,200ºC. If 1.0 mole of SO2 and 2.0 moles of NO2 are placed in a 20.L container, what concentration of SO3 will be present at equilibrium?

A) 0.48 mol/L B) 0.11 mol/L C) 0.95 mol/L D) 2.22 mol/L E) 18 mol/L A) 0.48 mol/L B) 0.11 mol/L C) 0.95 mol/L D) 2.22 mol/L E) 18 mol/L

Phosgene, COCl2, a poisonous gas, decomposes according to the equation COCl2(g) CO(g)+ Cl2(g). Calculate Kp for this reaction if Kc = 0.083 at 900ºC.

A) 0.125 B) 8.0 C) 6.1 D) 0.16 E) 0.083 A) 0.125 B) 8.0 C) 6.1 D) 0.16 E) 0.083

If one starts with pure NO2(g)at a pressure of 0.500 atm, the total pressure inside the reaction vessel when 2NO2(g) 2NO(g)+ O2(g)reaches equilibrium is 0.674 atm. Calculate the equilibrium partial pressure of NO2.

A) 0.152 atm B) 0.174 atm C) 0.200 atm D) 0.326 atm E) The total pressure cannot be calculated because Kp is not given A) 0.152 atm B) 0.174 atm C) 0.200 atm D) 0.326 atm E) The total pressure cannot be calculated because Kp is not given

Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine. CCl4(g)+ 1/2O2(g) COCl2(g)+ Cl2(g), Kc = 4.4 * 109 at 1,000 K Calculate Kc for the reaction 2CCl4(g)+ O2(g) 2COCl2(g)+ 2Cl2(g).

A) 4.4 * 109 B) 8.8 * 109 C) 1.9 * 1010 D) 1.9 * 1019 E) 2.3 * 10-10 A) 4.4 * 109 B) 8.8 * 109 C) 1.9 * 1010 D) 1.9 * 1019 E) 2.3 * 10-10

The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science. CO2(aq)+ H2O(l) H2CO3(aq) Which one of the following is the correct equilibrium constant expression (Kc)for this reaction?

A) B) Kc = C) Kc = D) Kc = E) Kc = A) B) Kc = C) Kc = D) Kc = E) Kc =

For the following reaction at equilibrium in a reaction vessel, which one of these changes would cause the Br2 concentration to increase? 2NOBr(g) 2NO(g)+ Br2(g), $\Delta$Hºrxn= 30 kJ/mol

A) Lower the temperature. B) Remove some NO. C) Remove some NOBr. D) Compress the gas mixture into a smaller volume. A) Lower the temperature. B) Remove some NO. C) Remove some NOBr. D) Compress the gas mixture into a smaller volume.

Exam 14: Chemical Equilibrium

The reaction A(g)+ 2B(g) C(g)was allowed to come to equilibrium. The initial amounts of reactants placed into a 5.00 L vessel were 1.0 mol A and 1.8 mol B. After the reaction reached equilibrium, 1.0 mol of B was found. Calculate K_c for this reaction.

(Multiple Choice)

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Question 41

On analysis, an equilibrium mixture for the reaction 2H₂S(g) 2H₂(g)+ S₂(g)was found to contain 1.0 mol H₂S, 4.0 mol H₂, and 0.80 mol S₂ in a 4.0 L vessel. Calculate the equilibrium constant, K_c, for this reaction.

(Multiple Choice)

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Question 42

K_c for the reaction CO₂(g)+ H₂(g) H₂O(g)+ CO(g)is 1.6 at about 990ºC.Calculate the number of moles of carbon monoxide in the final equilibrium system obtained by initially adding 1.00 mol of H₂, 2.00 mol of CO₂, 0.750 mol of H₂O, and 1.00 mol of CO to a 5.00 L reactor at 990ºC.

(Short Answer)

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Question 43

For the reaction SO₂(g)+ NO₂(g) SO₃(g)+ NO(g), the equilibrium constant is 18.0 at 1,200ºC. If 1.0 mole of SO₂ and 2.0 moles of NO₂ are placed in a 20.L container, what concentration of SO₃ will be present at equilibrium?

(Multiple Choice)

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Question 44

Phosgene, COCl₂, a poisonous gas, decomposes according to the equation COCl₂(g) CO(g)+ Cl₂(g). Calculate K_p for this reaction if K_c = 0.083 at 900ºC.

(Multiple Choice)

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Question 45

Consider the following equilibrium, 4NH₃(g)+ 3O₂(g) 2N₂(g)+ 6H₂O(g)+ 1531 kJ State whether the concentrations of the products would increase, decrease, or remain constant when the temperature is increased.

(Short Answer)

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Question 46

Consider the equilibrium equation C(s)+ H₂O(g)+ 2296 J CO(g)+ H₂(g).If additional gaseous water is added to this reaction mixture, what will happen to the temperature of the mixture?

(Short Answer)

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Question 47

Describe why addition of a catalyst does not affect the equilibrium constant for a reaction.

(Essay)

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Question 48

If one starts with pure NO₂(g)at a pressure of 0.500 atm, the total pressure inside the reaction vessel when 2NO₂(g) 2NO(g)+ O₂(g)reaches equilibrium is 0.674 atm. Calculate the equilibrium partial pressure of NO₂.

(Multiple Choice)

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Question 49

Which of these statements is true about chemical equilibria in general?

(Multiple Choice)

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Question 50

When the substances in the equation below are at equilibrium, at pressure P and temperature T, the equilibrium can be shifted to favor the products by CuO(s)+ H₂(g) $When the substances in the equation below are at equilibrium, at pressure P and temperature T, the equilibrium can be shifted to favor the products by CuO(s)+ H2(g) H2O(g)+ Cu(s) \Delta Hºrxn = -2.0 kJ/mol$ H₂O(g)+ Cu(s) $\Delta$ Hº_rxn = -2.0 kJ/mol

(Multiple Choice)

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Question 51

Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine. CCl₄(g)+ ¹/₂O₂(g) COCl₂(g)+ Cl₂(g), K_c = 4.4 * 10⁹ at 1,000 K Calculate K_c for the reaction 2CCl₄(g)+ O₂(g) 2COCl₂(g)+ 2Cl₂(g).

(Multiple Choice)

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Question 52

Calculate K_c for the reaction 2HI(g) H₂(g)+ I₂(g)given that the concentrations of each species at equilibrium are as follows: [HI] = 0.85 mol/L, [I₂] = 0.60 mol/L, [H₂] = 0.27 mol/L.

(Multiple Choice)

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Question 53

At 250ºC, the equilibrium constant K_p for the reaction PCl₅(g) PCl₃(g)+ Cl₂(g)is 1.80.Sufficient PCl₅ is put into a reaction vessel to give an initial pressure of 2.74 atm at 250ºC.Calculate the pressure of PCl₅ after the system has reached equilibrium.

(Multiple Choice)

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Question 54

The equilibrium constant for the chemical equation 2NO(g)+ O₂(g) 2NO₂(g) is two times the equilibrium constant for the chemical equation NO(g)+ ¹/₂O₂(g) NO₂(g).

(True/False)

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Question 55

The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science. CO₂(aq)+ H₂O(l) H₂CO₃(aq) Which one of the following is the correct equilibrium constant expression (K_c)for this reaction?

(Multiple Choice)

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Question 56

Hydrogen iodide decomposes according to the equation: 2HI(g) H₂(g)+ I₂(g), K_c = 0.0156 at 400ºC A 0.660 mol sample of HI was injected into a 2.00 L reaction vessel held at 400ºC. Calculate the concentration of HI at equilibrium.

(Short Answer)

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Question 57

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

(Multiple Choice)

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Question 58

For the following reaction at equilibrium in a reaction vessel, which one of these changes would cause the Br₂ concentration to increase? 2NOBr(g) $For the following reaction at equilibrium in a reaction vessel, which one of these changes would cause the Br2 concentration to increase? 2NOBr(g) 2NO(g)+ Br2(g), \Delta Hºrxn= 30 kJ/mol$ 2NO(g)+ Br₂(g), $\Delta$ Hº_rxn= 30 kJ/mol

(Multiple Choice)

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Question 59

Consider the two gaseous equilibria: The values of the equilibrium constants K₁ and K₂are related by

(Multiple Choice)

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Question 60

Showing 41 - 60 of 100

Exam 14: Chemical Equilibrium

The reaction A(g)+ 2B(g) C(g)was allowed to come to equilibrium. The initial amounts of reactants placed into a 5.00 L vessel were 1.0 mol A and 1.8 mol B. After the reaction reached equilibrium, 1.0 mol of B was found. Calculate Kc for this reaction.

On analysis, an equilibrium mixture for the reaction 2H2S(g) 2H2(g)+ S2(g)was found to contain 1.0 mol H2S, 4.0 mol H2, and 0.80 mol S2 in a 4.0 L vessel. Calculate the equilibrium constant, Kc, for this reaction.

Kc for the reaction CO2(g)+ H2(g) H2O(g)+ CO(g)is 1.6 at about 990ºC.Calculate the number of moles of carbon monoxide in the final equilibrium system obtained by initially adding 1.00 mol of H2, 2.00 mol of CO2, 0.750 mol of H2O, and 1.00 mol of CO to a 5.00 L reactor at 990ºC.

For the reaction SO2(g)+ NO2(g) SO3(g)+ NO(g), the equilibrium constant is 18.0 at 1,200ºC. If 1.0 mole of SO2 and 2.0 moles of NO2 are placed in a 20.L container, what concentration of SO3 will be present at equilibrium?

Phosgene, COCl2, a poisonous gas, decomposes according to the equation COCl2(g) CO(g)+ Cl2(g). Calculate Kp for this reaction if Kc = 0.083 at 900ºC.

Consider the following equilibrium, 4NH3(g)+ 3O2(g) 2N2(g)+ 6H2O(g)+ 1531 kJ State whether the concentrations of the products would increase, decrease, or remain constant when the temperature is increased.

Consider the equilibrium equation C(s)+ H2O(g)+ 2296 J CO(g)+ H2(g).If additional gaseous water is added to this reaction mixture, what will happen to the temperature of the mixture?

Describe why addition of a catalyst does not affect the equilibrium constant for a reaction.

If one starts with pure NO2(g)at a pressure of 0.500 atm, the total pressure inside the reaction vessel when 2NO2(g) 2NO(g)+ O2(g)reaches equilibrium is 0.674 atm. Calculate the equilibrium partial pressure of NO2.

Which of these statements is true about chemical equilibria in general?

When the substances in the equation below are at equilibrium, at pressure P and temperature T, the equilibrium can be shifted to favor the products by CuO(s)+ H2(g) H2O(g)+ Cu(s) Δ\DeltaΔ Hºrxn = -2.0 kJ/mol

Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine. CCl4(g)+ 1/2O2(g) COCl2(g)+ Cl2(g), Kc = 4.4 * 109 at 1,000 K Calculate Kc for the reaction 2CCl4(g)+ O2(g) 2COCl2(g)+ 2Cl2(g).

Calculate Kc for the reaction 2HI(g) H2(g)+ I2(g)given that the concentrations of each species at equilibrium are as follows: [HI] = 0.85 mol/L, [I2] = 0.60 mol/L, [H2] = 0.27 mol/L.

At 250ºC, the equilibrium constant Kp for the reaction PCl5(g) PCl3(g)+ Cl2(g)is 1.80.Sufficient PCl5 is put into a reaction vessel to give an initial pressure of 2.74 atm at 250ºC.Calculate the pressure of PCl5 after the system has reached equilibrium.

The equilibrium constant for the chemical equation 2NO(g)+ O2(g) 2NO2(g) is two times the equilibrium constant for the chemical equation NO(g)+ 1/2O2(g) NO2(g).

The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science. CO2(aq)+ H2O(l) H2CO3(aq) Which one of the following is the correct equilibrium constant expression (Kc)for this reaction?

Hydrogen iodide decomposes according to the equation: 2HI(g) H2(g)+ I2(g), Kc = 0.0156 at 400ºC A 0.660 mol sample of HI was injected into a 2.00 L reaction vessel held at 400ºC. Calculate the concentration of HI at equilibrium.

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

For the following reaction at equilibrium in a reaction vessel, which one of these changes would cause the Br2 concentration to increase? 2NOBr(g) 2NO(g)+ Br2(g), Δ\DeltaΔ Hºrxn= 30 kJ/mol

Consider the two gaseous equilibria: The values of the equilibrium constants K1 and K2 are related by

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The reaction A(g)+ 2B(g) C(g)was allowed to come to equilibrium. The initial amounts of reactants placed into a 5.00 L vessel were 1.0 mol A and 1.8 mol B. After the reaction reached equilibrium, 1.0 mol of B was found. Calculate K_c for this reaction.

On analysis, an equilibrium mixture for the reaction 2H₂S(g) 2H₂(g)+ S₂(g)was found to contain 1.0 mol H₂S, 4.0 mol H₂, and 0.80 mol S₂ in a 4.0 L vessel. Calculate the equilibrium constant, K_c, for this reaction.

K_c for the reaction CO₂(g)+ H₂(g) H₂O(g)+ CO(g)is 1.6 at about 990ºC.Calculate the number of moles of carbon monoxide in the final equilibrium system obtained by initially adding 1.00 mol of H₂, 2.00 mol of CO₂, 0.750 mol of H₂O, and 1.00 mol of CO to a 5.00 L reactor at 990ºC.

For the reaction SO₂(g)+ NO₂(g) SO₃(g)+ NO(g), the equilibrium constant is 18.0 at 1,200ºC. If 1.0 mole of SO₂ and 2.0 moles of NO₂ are placed in a 20.L container, what concentration of SO₃ will be present at equilibrium?

Phosgene, COCl₂, a poisonous gas, decomposes according to the equation COCl₂(g) CO(g)+ Cl₂(g). Calculate K_p for this reaction if K_c = 0.083 at 900ºC.

Consider the following equilibrium, 4NH₃(g)+ 3O₂(g) 2N₂(g)+ 6H₂O(g)+ 1531 kJ State whether the concentrations of the products would increase, decrease, or remain constant when the temperature is increased.

Consider the equilibrium equation C(s)+ H₂O(g)+ 2296 J CO(g)+ H₂(g).If additional gaseous water is added to this reaction mixture, what will happen to the temperature of the mixture?

If one starts with pure NO₂(g)at a pressure of 0.500 atm, the total pressure inside the reaction vessel when 2NO₂(g) 2NO(g)+ O₂(g)reaches equilibrium is 0.674 atm. Calculate the equilibrium partial pressure of NO₂.

Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine. CCl₄(g)+ ¹/₂O₂(g) COCl₂(g)+ Cl₂(g), K_c = 4.4 * 10⁹ at 1,000 K Calculate K_c for the reaction 2CCl₄(g)+ O₂(g) 2COCl₂(g)+ 2Cl₂(g).

Calculate K_c for the reaction 2HI(g) H₂(g)+ I₂(g)given that the concentrations of each species at equilibrium are as follows: [HI] = 0.85 mol/L, [I₂] = 0.60 mol/L, [H₂] = 0.27 mol/L.

At 250ºC, the equilibrium constant K_p for the reaction PCl₅(g) PCl₃(g)+ Cl₂(g)is 1.80.Sufficient PCl₅ is put into a reaction vessel to give an initial pressure of 2.74 atm at 250ºC.Calculate the pressure of PCl₅ after the system has reached equilibrium.

The equilibrium constant for the chemical equation 2NO(g)+ O₂(g) 2NO₂(g) is two times the equilibrium constant for the chemical equation NO(g)+ ¹/₂O₂(g) NO₂(g).

The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science. CO₂(aq)+ H₂O(l) H₂CO₃(aq) Which one of the following is the correct equilibrium constant expression (K_c)for this reaction?

Hydrogen iodide decomposes according to the equation: 2HI(g) H₂(g)+ I₂(g), K_c = 0.0156 at 400ºC A 0.660 mol sample of HI was injected into a 2.00 L reaction vessel held at 400ºC. Calculate the concentration of HI at equilibrium.

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

Consider the two gaseous equilibria: The values of the equilibrium constants K₁ and K₂are related by