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Given the following standard heats of re...

Given the following standard heats of reactions.
(i) heat of formation of water = -68.3 kcal (ii) heat of combustion of acetylene = `-310 kcal ` (iii) heat of combustion of ethylene kcal Calculate the heat of reaction for the hydrogenation of acetylene at constant volume `(25^@C)`.

A

at constant pressure= `-41.104` kcal

B

at constant volume `= -41.7` kcal

C

at constant pressure `= -41.7` kcal

D

at constant volume `= -42.104` kcal

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