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Gibb's Energy and Nernst Equation

The expressio...

Question

The expression for equilibrium constant, $K_{c}$ for the following reaction is :
$2 C u (N O_{3})_{2 (s)} ⇌ 2 C u O_{(} s) + 4 N O_{2 (g)} + O_{2 (g)}$

K_{c} = \frac{[C u O_{(} s)]^{2} [N O_{2 (g)}]^{4} [O_{2 (g)}]}{[C u (N O_{3})_{2 (s)}]^{2}}

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K_{c} = \frac{[N O_{2 (g)}]^{4} [O_{2 (g)}]}{[C u (N O_{3})_{2 (s)}]^{2}}

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K_{c} = [N O_{2 (g)}]^{4} [O_{2 (g)}]

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K_{c} = \frac{[C u O_{(} s)]^{2}}{[C u (N O_{3})_{2 (s)}]^{2}}

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Solution

The correct option is D $K_{c} = [N O_{2 (g)}]^{4} [O_{2 (g)}]$
$2 C u (N O_{3})_{2} (s) ⇌ 2 C u O + 4 N O_{2} (g) + O_{2} (g)$
$K_{c} = \frac{[N O_{2} (g)]^{4} [O_{2} (g)] [C u O (s)]^{2}}{[C u (N O_{3})_{2} (s)}$
Since concentration of solids is taken as 1, the expression for
$K_{c} = [N O_{2} (g)]^{4} [O_{2} (g)]$

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