Answer: A mixture of H2, S, and H2S is held in a 1.0-L

Chapter 10, Problem 73AE

(choose chapter or problem)

A mixture of H2, S, and H2S is held in a 1.0-L vessel at 90°C and reacts according to the equation:

H2(g) + S(s) H2S(g)

At equilibrium the mixture contains 0.46 g of H2S and 0.40 g H2.

(a) Write the equilibrium-constant expression for this re- action.

(b) What is the value of Kc for the reaction at this temperature?

(c) Why can we ignore the amount of S when doing the calculation in part (b)?

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