10. The value of K eq for the equilibrium CO 2 (g) + 2H 2 (g) INCLUDEPICTURE \"h

Question

10. The value of Keq for the equilibrium

CO2 (g) + 2H2 (g) INCLUDEPICTURE "http://session.masteringchemistry.com/problemAsset/1801226/1/doublearrowshort.jpg" * MERGEFORMATINET CH3OH (g)   is 14.5 at 483 °C. What is the value of Keq for the

equilibrium below?

1/2 CO2 + H2 (g) INCLUDEPICTURE "http://session.masteringchemistry.com/problemAsset/1801226/1/doublearrowshort.jpg" * MERGEFORMATINET 1/2 CH3OH (g)

[A] 7.35 [B] 7.30 [C] 6.90 10-2 [D] 3.81 [E] 0.136

11. Given the following reaction at equilibrium at 300.0 K:

NH4HS (s) INCLUDEPICTURE "http://session.masteringchemistry.com/problemAsset/1801240/3/doublearrowshort.jpg" * MERGEFORMATINET NH3 (g) + H2S (g)

If pNH3 = pH2S = 0.107 atm, Kp = _____

   [A] 0821 [B] 0114 [C] 107 [D] 4.99 10-4 [E] 5.66 10-3

12. Which one of the following will change the value of an equilibrium constant?

[A] varying the initial concentrations of reactants

[B] adding other substances that do not react with any of the species involved in the equilibrium

   [C] changing temperature

   [D] varying the initial concentrations of products

   [E] changing the volume of the reaction vessel

Explanation / Answer

10.

co2 + 2H2 ---> CH3OH Kp1 = 14.5

1/2(co2 + 2H2 ---> CH3OH) kp = (14.5)^(1/2) = 3.81

answer: D

11.   NH4HS (s) ----> NH3 (g) + H2S (g)

kp = pNH3*pH2S

   = 0.107^2 = 0.01145

ANSWER: 0.01145

12. [C] changing temperature

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