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If the system 3H2(g)+ N2(g) If the system 3H<sub>2</sub>(g)+ N<sub>2</sub>(g)   <sub> </sub> 2NH<sub>3</sub>(g)is at equilibrium and more N<sub>2</sub> is added, a net reaction that consumes some of the added N<sub>2</sub> will occur until a new equilibrium is reached. 2NH3(g)is at equilibrium and more N2 is added, a net reaction that consumes some of the added N2 will occur until a new equilibrium is reached.

A) True
B) False

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A solution was prepared such that the initial concentrations of Cu2+(aq)and CN-(aq)were 0.0120 M and 0.0400 M, respectively.These ions react according to the following chemical equation A solution was prepared such that the initial concentrations of Cu<sup>2+</sup>(aq)and CN<sup>-</sup>(aq)were 0.0120 M and 0.0400 M, respectively.These ions react according to the following chemical equation    What will be the concentration of CN<sup>-</sup>(aq)at equilibrium? What will be the concentration of CN-(aq)at equilibrium?

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8.4 * 10

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Hydrogen iodide decomposes according to the equation 2HI(g) Hydrogen iodide decomposes according to the equation 2HI(g)    <sub> </sub> H<sub>2</sub>(g) + I<sub>2</sub>(g) , for which K<sub>c</sub> = 0.0156 at 400ºC. 0.550 mol HI was injected into a 2.00 L reaction vessel at 400ºC.Calculate the concentration of H<sub>2</sub> at equilibrium. A) 0.275 M B) 0.138 M C) 0.0275 M D) 0.0550 M E) 0.220 M H2(g) + I2(g) , for which Kc = 0.0156 at 400ºC. 0.550 mol HI was injected into a 2.00 L reaction vessel at 400ºC.Calculate the concentration of H2 at equilibrium.


A) 0.275 M
B) 0.138 M
C) 0.0275 M
D) 0.0550 M
E) 0.220 M

F) C) and E)
G) A) and E)

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Consider the following equilibrium, 4NH3(g)+ 3O2(g) Consider the following equilibrium, 4NH<sub>3</sub>(g)+ 3O<sub>2</sub>(g)   <sub> </sub> 2N<sub>2</sub>(g)+ 6H<sub>2</sub>O(g)+ 1531 kJ State whether the concentrations the reactants would increase, decrease, or remain constant after nitrogen gas was removed from the system. 2N2(g)+ 6H2O(g)+ 1531 kJ State whether the concentrations the reactants would increase, decrease, or remain constant after nitrogen gas was removed from the system.

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Hydrogen iodide decomposes according to the equation: 2HI(g) Hydrogen iodide decomposes according to the equation: 2HI(g)   <sub> </sub> H<sub>2</sub>(g)+ I<sub>2</sub>(g), K<sub>c</sub> = 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 H<sub>2</sub> equilibrium. 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 H2 equilibrium.

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Which of these situations will result if some CH4(g) is removed from the reaction CO(g) + 3H2(g) Which of these situations will result if some CH<sub>4</sub>(g) is removed from the reaction CO(g) + 3H<sub>2</sub>(g)    <sub> </sub> CH<sub>4</sub>(g) + H<sub>2</sub>O(g) at equilibrium? A) H<sub>2</sub>O will be consumed. B) More CH<sub>4</sub> and H<sub>2</sub>O will be produced. C) K<sub>p</sub> will decrease. D) More CO will be produced. E) No change will occur. CH4(g) + H2O(g) at equilibrium?


A) H2O will be consumed.
B) More CH4 and H2O will be produced.
C) Kp will decrease.
D) More CO will be produced.
E) No change will occur.

F) B) and E)
G) A) and C)

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Consider the reaction N2(g)+ 3H2(g) Consider the reaction N<sub>2</sub>(g)+ 3H<sub>2</sub>(g)   <sub> </sub> 2NH<sub>3</sub>(g). If hydrogen gas is added to this system at equilibrium, which direction will the reaction shift? 2NH3(g). If hydrogen gas is added to this system at equilibrium, which direction will the reaction shift?

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The reacti...

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When the reaction 2H2S(g) When the reaction 2H<sub>2</sub>S(g)    <sub> </sub> <sub> </sub>2H<sub>2</sub>(g) + S<sub>2</sub>(g) is carried out at 1065°C, K<sub>p</sub> = 0.012. Starting with pure H<sub>2</sub>S at 1065°, what must the initial pressure of H<sub>2</sub>S be if the equilibrated mixture at this temperature is to contain 0.250 atm of H<sub>2</sub>(g) ? A) 1.06 atm B) 1.86 atm C) 0.94 atm D) 0.90 atm E) 1.52 atm 2H2(g) + S2(g) is carried out at 1065°C, Kp = 0.012. Starting with pure H2S at 1065°, what must the initial pressure of H2S be if the equilibrated mixture at this temperature is to contain 0.250 atm of H2(g) ?


A) 1.06 atm
B) 1.86 atm
C) 0.94 atm
D) 0.90 atm
E) 1.52 atm

F) All of the above
G) A) and C)

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The dissociation of solid silver chloride in water to produce silver ions and chloride ions has an equilibrium constant of 1.8 * 10-18.Based on the magnitude of the equilibrium constant, is silver chloride very soluble in water? Why?

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Kc here will be [Ag+

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Consider the reaction N2(g)+ 3H2(g) Consider the reaction N<sub>2</sub>(g)+ 3H<sub>2</sub>(g)   <sub> </sub> 2NH<sub>3</sub>(g). If nitrogen is added to the system at equilibrium, what will happen to the ammonia concentration? 2NH3(g). If nitrogen is added to the system at equilibrium, what will happen to the ammonia concentration?

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Consider the chemical reaction 2NH3(g) Consider the chemical reaction 2NH<sub>3</sub>(g)   <sub> </sub> N<sub>2</sub>(g)+ 3H<sub>2</sub>(g).The equilibrium is to be established in a 1.0 L container at 1,000 K, where K<sub>c</sub> = 4.0 * 10<sup>-2</sup>. Initially, 1,220 moles of NH<sub>3</sub>(g)are present.Estimate the equilibrium concentration of H<sub>2</sub>(g). N2(g)+ 3H2(g).The equilibrium is to be established in a 1.0 L container at 1,000 K, where Kc = 4.0 * 10-2. Initially, 1,220 moles of NH3(g)are present.Estimate the equilibrium concentration of H2(g).

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Which is the correct equilibrium constant expression for the following reaction? Fe2O3(s) + 3H2(g) Which is the correct equilibrium constant expression for the following reaction? Fe<sub>2</sub>O<sub>3</sub>(s) + 3H<sub>2</sub>(g)    <sub> </sub> <sub> </sub>2Fe(s) + 3H<sub>2</sub>O(g)  A) K<sub>c</sub> = [Fe<sub>2</sub>O<sub>3</sub>] [H<sub>2</sub>]<sup>3 </sup>/<sup> </sup>[Fe]<sup>2</sup>[H<sub>2</sub>O]<sup>3</sup> B) K<sub>c</sub> = [H<sub>2</sub>]<sup> </sup>/<sup> </sup>[H<sub>2</sub>O] C) K<sub>c</sub> = [H<sub>2</sub>O]<sup>3 </sup>/ [H<sub>2</sub>]<sup>3</sup> D) K<sub>c</sub> = [Fe]<sup>2</sup>[H<sub>2</sub>O]<sup>3 </sup>/ [Fe<sub>2</sub>O<sub>3</sub>] [H<sub>2</sub>]<sup>3</sup> E) K<sub>c</sub> = [Fe] [H<sub>2</sub>O] / [Fe<sub>2</sub>O<sub>3</sub>] [H<sub>2</sub>] 2Fe(s) + 3H2O(g)


A) Kc = [Fe2O3] [H2]3 / [Fe]2[H2O]3
B) Kc = [H2] / [H2O]
C) Kc = [H2O]3 / [H2]3
D) Kc = [Fe]2[H2O]3 / [Fe2O3] [H2]3
E) Kc = [Fe] [H2O] / [Fe2O3] [H2]

F) B) and D)
G) A) and E)

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For the reaction H2(g)+ I2(g) For the reaction H<sub>2</sub>(g)+ I<sub>2</sub>(g)   <sub> </sub> 2HI(g), K<sub>P</sub> = K<sub>c</sub>. 2HI(g), KP = Kc.

A) True
B) False

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Consider this reaction at equilibrium: 2SO2(g) + O2(g)  Consider this reaction at equilibrium: 2SO<sub>2</sub>(g) + O<sub>2</sub>(g)    <sub> </sub> 2SO<sub>3</sub>(g) ,  \Delta Hº<sub>rxn</sub> = -198 kJ/mol If the volume of the system is compressed at constant temperature, what change will occur in the position of the equilibrium? A) A shift to produce more SO<sub>2</sub> B) A shift to produce more O<sub>2</sub> C) No change D) A shift to produce more SO<sub>3</sub> 2SO3(g) , Δ\Deltarxn = -198 kJ/mol If the volume of the system is compressed at constant temperature, what change will occur in the position of the equilibrium?


A) A shift to produce more SO2
B) A shift to produce more O2
C) No change
D) A shift to produce more SO3

E) A) and B)
F) A) and C)

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Kc for the reaction CO2(g)+ H2(g) K<sub>c</sub> for the reaction CO<sub>2</sub>(g)+ H<sub>2</sub>(g)   <sub> </sub> H<sub>2</sub>O(g)+ CO(g)is 1.6 at about 990ºC.Calculate the number of moles of water in the final equilibrium system obtained by initially adding 1.00 mol of H<sub>2</sub>, 2.00 mol of CO<sub>2</sub>, 0.750 mol of H<sub>2</sub>O, and 1.00 mol of CO to a 5.00 L reactor at 990ºC. H2O(g)+ CO(g)is 1.6 at about 990ºC.Calculate the number of moles of water 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.

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Consider the following equilibria: 2SO3(g) Consider the following equilibria: 2SO<sub>3</sub>(g)    <sub>NEW</sub><sub>LINE</sub> 2SO<sub>2</sub>(g) + O<sub>2</sub>(g) K<sub>c</sub> = 2.3 * 10<sup>-7</sup> <sup> </sup>2NO<sub>3</sub>(g)    <sub> </sub> 2NO<sub>2</sub>(g) + O<sub>2</sub>(g) K<sub>c</sub> = 1.4 * 10<sup>-3</sup> <sup> </sup>Calculate the equilibrium constant for the reaction SO<sub>2</sub>(g) + NO<sub>3</sub>(g)    <sub> </sub> SO<sub>3</sub>(g) + NO<sub>2</sub>(g)  A) 78 B) 1.3 * 10<sup>-2</sup> C) 1.6 * 10<sup>-4</sup> D) 3.2 * 10<sup>-10</sup> E) 6.1 * 10<sup>3</sup> NEWLINE 2SO2(g) + O2(g) Kc = 2.3 * 10-7 2NO3(g) Consider the following equilibria: 2SO<sub>3</sub>(g)    <sub>NEW</sub><sub>LINE</sub> 2SO<sub>2</sub>(g) + O<sub>2</sub>(g) K<sub>c</sub> = 2.3 * 10<sup>-7</sup> <sup> </sup>2NO<sub>3</sub>(g)    <sub> </sub> 2NO<sub>2</sub>(g) + O<sub>2</sub>(g) K<sub>c</sub> = 1.4 * 10<sup>-3</sup> <sup> </sup>Calculate the equilibrium constant for the reaction SO<sub>2</sub>(g) + NO<sub>3</sub>(g)    <sub> </sub> SO<sub>3</sub>(g) + NO<sub>2</sub>(g)  A) 78 B) 1.3 * 10<sup>-2</sup> C) 1.6 * 10<sup>-4</sup> D) 3.2 * 10<sup>-10</sup> E) 6.1 * 10<sup>3</sup> 2NO2(g) + O2(g) Kc = 1.4 * 10-3 Calculate the equilibrium constant for the reaction SO2(g) + NO3(g) Consider the following equilibria: 2SO<sub>3</sub>(g)    <sub>NEW</sub><sub>LINE</sub> 2SO<sub>2</sub>(g) + O<sub>2</sub>(g) K<sub>c</sub> = 2.3 * 10<sup>-7</sup> <sup> </sup>2NO<sub>3</sub>(g)    <sub> </sub> 2NO<sub>2</sub>(g) + O<sub>2</sub>(g) K<sub>c</sub> = 1.4 * 10<sup>-3</sup> <sup> </sup>Calculate the equilibrium constant for the reaction SO<sub>2</sub>(g) + NO<sub>3</sub>(g)    <sub> </sub> SO<sub>3</sub>(g) + NO<sub>2</sub>(g)  A) 78 B) 1.3 * 10<sup>-2</sup> C) 1.6 * 10<sup>-4</sup> D) 3.2 * 10<sup>-10</sup> E) 6.1 * 10<sup>3</sup> SO3(g) + NO2(g)


A) 78
B) 1.3 * 10-2
C) 1.6 * 10-4
D) 3.2 * 10-10
E) 6.1 * 103

F) A) and B)
G) A) and C)

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The data below refer to the following reaction: 2NO(g)+ Br2(g) The data below refer to the following reaction: 2NO(g)+ Br<sub>2</sub>(g)   <sub> </sub> 2NOBr(g)   Calculate K<sub>c</sub>. 2NOBr(g) The data below refer to the following reaction: 2NO(g)+ Br<sub>2</sub>(g)   <sub> </sub> 2NOBr(g)   Calculate K<sub>c</sub>. Calculate Kc.

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A solution was prepared such that the initial concentrations of Cu2+(aq)and CN-(aq)were 0.0120 M and 0.0400 M, respectively.These ions react according to the following chemical equation A solution was prepared such that the initial concentrations of Cu<sup>2+</sup>(aq)and CN<sup>-</sup>(aq)were 0.0120 M and 0.0400 M, respectively.These ions react according to the following chemical equation    What will be the concentration of Cu<sup>2+</sup>(aq)at equilibrium? What will be the concentration of Cu2+(aq)at equilibrium?

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For the reaction PCl3(g) + Cl2(g) For the reaction PCl<sub>3</sub>(g) + Cl<sub>2</sub>(g)    <sub> </sub> PCl<sub>5</sub>(g) at a particular temperature, K<sub>c</sub> = 24.3.Suppose a system at that temperature is prepared with [PCl<sub>3</sub>] = 0.10 M, [Cl<sub>2</sub>] = 0.15 M, and [PCl<sub>5</sub>] = 0.60 M. Which of these statements is true? A) The reaction is at equilibrium. B) The reaction will proceed in the direction of forming more PCl<sub>5</sub> until equilibrium is reached. C) The reaction will proceed in the direction of forming more PCl<sub>3</sub> and Cl<sub>2</sub> until equilibrium is reached. D) None of the above statements is true. PCl5(g) at a particular temperature, Kc = 24.3.Suppose a system at that temperature is prepared with [PCl3] = 0.10 M, [Cl2] = 0.15 M, and [PCl5] = 0.60 M. Which of these statements is true?


A) The reaction is at equilibrium.
B) The reaction will proceed in the direction of forming more PCl5 until equilibrium is reached.
C) The reaction will proceed in the direction of forming more PCl3 and Cl2 until equilibrium is reached.
D) None of the above statements is true.

E) All of the above
F) C) and D)

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The equilibrium constant expression for the reaction 2BrF5(g) The equilibrium constant expression for the reaction 2BrF<sub>5</sub>(g)    <sub> </sub> Br<sub>2</sub>(g) + 5F<sub>2</sub>(g) is A) K<sub>c</sub> = [Br<sub>2</sub>] [F<sub>2</sub>]<sup> </sup>/<sup> </sup>[BrF<sub>5</sub>] B) K<sub>c</sub> = [Br<sub>2</sub>] [F<sub>2</sub>]<sup>5 </sup>/<sup> </sup>[BrF<sub>5</sub>]<sup>2</sup> C) K<sub>c</sub> = [Br<sub>2</sub>] [F<sub>2</sub>]<sup>2 </sup>/<sup> </sup>[BrF<sub>5</sub>]<sup>5</sup> D) K<sub>c</sub> = [BrF<sub>5</sub>]<sup>2 </sup>/<sup> </sup>[Br<sub>2</sub>][F<sub>2</sub>]<sup>5</sup> E) K<sub>c</sub> = 2[BrF<sub>5</sub>]<sup>2 </sup>/<sup> </sup>([Br<sub>2</sub>] * 5[F<sub>2</sub>]<sup>5</sup>) Br2(g) + 5F2(g) is


A) Kc = [Br2] [F2] / [BrF5]
B) Kc = [Br2] [F2]5 / [BrF5]2
C) Kc = [Br2] [F2]2 / [BrF5]5
D) Kc = [BrF5]2 / [Br2][F2]5
E) Kc = 2[BrF5]2 / ([Br2] * 5[F2]5)

F) B) and C)
G) None of the above

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