For the reaction 2H2(g) + O2(g) 2H2O(g) which of the following is the equilibrium constant expression?

K = [H2][O2]/[NH2O]
K = [H2O]/[H2][O2]
K = [H2O]2/[H2]2[O2]
K = [H2]^2[O2]/[H2O]^2

Answer:
3) 2H2(g) + O2(g) --> 2H2O(g)

Keq = [H2O]^2/[H2]^2[O2]
2H2 + O2 ↔2H2O

K = ([H2O]^2) / ([H2]^2 x [O2])

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