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April 19, 2014

Homework Help: Chemistry

Posted by Sam on Monday, April 9, 2012 at 8:58pm.

Need help in AP chemistry on Equilibrium

When heated, hydrogen sulfide gas decomposes according to the equation
2 H2S(g) ⇄ 2 H2(g) + S2(g)

A 3.40 g sample of H2S(g) is introduced into an evacuated rigid 1.25 L container. The sealed
container is heated to 483 K, and 3.72 x 10
-2
mol of S2(g) is present at equilibrium.

(a) Write the expression for the equilibrium constant, Kc, for the decomposition reaction
represented above.

(b) Calculate the equilibrium concentration, in mol L
-1
, of the following gases in the container
at 483 K.
(i) H2(g)
(ii) H2S (g)

(c) Calculate the value of the equilibrium constant, Kc, for the decomposition reaction at 483 K.

(d) For the reaction H2(g) + S2(g) ↔ H2S(g) at 483 K, calculate the value of the equilibrium
constant, Kc.

(e) Calculate the partial pressure of S2(g) in the container at equilibrium at 483 K

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