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Question

Choose the correct expression of Kc for reaction,
4NH3(g)+5O2(g)4NO(g)+6H2O(g)

A
Kc=[NO]4[H2O]6[NH3]4[O2]5
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B
Kc=[NH3]4[O2]5[NO]4[H2O]6
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C
Kc=[NH3][O2][NO][H2O]
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D
Kc=[NO][H2O][NH3][O2]
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Solution

The correct option is A Kc=[NO]4[H2O]6[NH3]4[O2]5
The equilibrium constant of the reaction, Kc, is the ratio of the equilibrium concentration of products over the equilibrium concentration of reactants each raised to the power of their stoichiometric coefficients.
Thus, for reaction
4NH3(g)+5O2(g)4NO(g)+6H2O(g)

Kc=[NO]4[H2O]6[NH3]4[O2]5

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