what is the s†an dard heat of reaction for C2H6+O2=CO2+H2O if s†an dard heat of combustion of C and H2 are 393.5and 285KJ per mole res.and s†an dard heatof fomation of C2H6 is 88.2KJ er

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When 2 mole of $C_{2} H_{6}$ are completely burnt, 3129 KJ of heat is liberated. Calculate the heat of formation of $C_{2} H_{6} . △ H_{f}$ for $C O_{2} & H_{2} O$ are -395 KJ and -286 KJ respectively.

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