The diffrence between heat of reaction at constant volume and constant pressure for the reaction

$C_{2} H_{2} (g) + \frac{5}{2} O_{2} (g) \to 2 C O_{2} (g) + H_{2} O (l) . A t 300 K i n k c a l i s : [G i v e n : R = 2 c a l / m o l . K]$

−0.3 kcal

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+0.3 kcal

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−0.9 kcal

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None of these

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Solution

The correct option is D None of these
$△ n_{g} = - \frac{3}{2}; △ H = △ U + △ n_{g} R T$

$△ U - △ H = △ n_{g} R T = - (- \frac{3}{2}) \times 2 \times 300 \Rightarrow 0.9 k c a l$

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The diffrence between heat of reaction at constant volume and constant pressure for the reaction

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