The standard heat of formation `(Delta_(f)H_(298)^(0))` of ethane (in kJ/mol), if the heat of combustion of ethane, hydrogen and graphite are `-1560, -393.5` and `-286kJ/mol`, respectively is _______.

The standard heat of formation (Delta_(f)H_(298)^(@)) of ethane (in kJ/mol), if the heat of combustion of ethane, hydrogen and graphite are -1560, -393.5 and -286" kJ/mol" ,respectively is

Calculate the resonance energy of isoprene (C_(5)H_(8)) from the data given. Standard Heats of combustion of isoprene, carbon and hydrogen are -3186, -393.5 , and -285.83 kJ mol^(-1) , respectively. Bond energies of C=C, C-C, C-H and H-H bonds are 615, 348, 413 and 435.8 kJ mol^(-1) respectively. Standard heat of sublimation of graphite is 718.3 kJ mol^(-1) .

Calculate the resonance enegry of isoprene (C_(5)H_(8)) from the data given. Standard Heats of combustion of isoprene, carbon and hydrogen are -3186, -393.5 , and -285.83 kJ mol^(-1) , respectively. Bond energies of C=C, C-C, C-H and H-H bonds are 615, 348, 413 and 435.8 kJ mol^(-1) respectively. Standard heat of sulbilmation of graphite is 718.3 kJ mol^(-1) .

Calculate the heat of the following reaction at 25^@C . C_2H_4(g) + H_2(g) to C_2H_6(g) The heats of combustion of ethylene, hydrogen and ethane are-1410 kJ, -286.2 kJ and -1560.6 kJ respectively at 25^@C .

Calculate the standard heat of formation of propane, if its heat of combustion is-2220.2 kJ "mol"^(-1) , the heats of formation of CO_(2(g)) and H_2O_((l)) are - 393.5 and -285.8 kJ "mol"^(-1) respectively.