Which is the correct equilibrium constant expression for the following reaction?
Fe2O3(s) + 3 H2 (g) <==> 2 Fe (s) + 3 H2O (g)
a. Kc = [Fe2O3][H2] / [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 = [H2O]3 / [H2]3
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