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For the reaction $C_{2} H_{4} (g) + H_{2} (g) ⇌ C_{2} H_{6} (g)$ , which of the following expressions between $K_{p}$ and $K_{c}$ is true at 27°C?

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K_{p} > K_{c}

K_{p} < K_{c}

K_{p} = K_{c}

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detailed solution

Correct option is B

$Δ ν_{g} = - 1; K_{p} = K_{c} / R T$ , where $R T = (0.082 {LatmK}^{- 1} {mol}^{- 1}) (300 K) = 24.6 {Latmmol}^{- 1}$

Obviously, $K_{p} < K_{c}$ .

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For the reaction C2H4(g)+H2(g)⇌C2H6(g), which of the following expressions between Kp and Kc is true at 27°C?