[" 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

The standard enthalpy of formation of octane (C_(8)H_(18)) is -250kJ //mol . Calculate the enthalpy of combustion of C_(8)H_(18) . The enthalpy of CO_(2)(g) and H_(2)O(l) are -394 kJ//mol and -286kJ//mol respectively.

Calculate the standard enthalpy of formation of n- butane. Given : standard enthalpy of combustion of n- butane, C (graphite) and H_(2)(g) " are " -2878.5 " kJ mol"^(-1), -393.5 " kJ mol"^(-1) and -285.8 " kJ mol"^(-1) respectively.

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 .