Calculate \( \Delta \mathrm{U} \) of reaction for the hydrogenation of acetylene at constant vol...

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Calculate \( \Delta \mathrm{U} \) of reaction for the hydrogenation of acetylene at constant volume and at \( 77^{\circ} \mathrm{C} \).

Given that \( -\Delta \mathrm{H}_{\mathrm{f}}\left(\mathrm{H}_{2} \mathrm{O}\right)=-67.8 \mathrm{kcal} \) mole; \( \Delta \mathrm{H}_{\text {comb }}\left(\mathrm{C}_{2} \mathrm{H}_{2}\right) \) \( =-310.1 \mathrm{kcal} / \mathrm{mole} \)
\( \Delta \mathrm{H}_{\mathrm{comb}}\left(\mathrm{C}_{2} \mathrm{H}_{4}\right)=-337.2 \mathrm{kcal} / \mathrm{mole} \)
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