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.

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 formation of CO_(2)(g) and H_(2)O(l) are -394 kJ//mol and -286kJ//mol respectively.

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 formation of CO_(2)(g) and H_(2)O(l) are -394 kJ//mol and -286kJ//mol respectively.

Calculate the standard enthalpy of formation of propane (C_(3)H_(8)) if its enthalpy of combustion is -2220.2 kJ "mol"^(-1) .The enthalpies of formation of CO_(2)(g) and H_(2)O(l) are -393.5 and -285.8 kJ "mol"^(-1) respectively.

Calculate the enthalpy of formation of acetic acid (CH_(3)COOH) if its enthalpy of combustion is 867 kJ mol^(-1) .The enthalpies of fromation of CO_(2)(g) and H_(2)O(l) are -393.5 and -285.9 kJ mol^(-1) respectively.

Enthalpy of combustion of benzene is -3267 kJ mol^(-1) . Calculate enthalpy of formation of benzene, given enthalpy of formation of CO_(2) and water are - 393.5 kJ mol^(-1) and -285.83 kJ mol^(-1) .

The enthalpy change for the reaction C_(3)H_(8)(g)+H_(2)(g) rarr C_(2)H_(6)(g)+CH_(4)(g) at 25^(@)C is -55.7 kJ/mol. Calculate the enthalpy of combustion of C_(2)H_(6)(g) . The enthalpy of combustion of H_(2) , & CH_(4) are -285.8 & -890.0 kJ/mol respectively. enthalpy of combustion of propane is -2220" kJ mol"^(-1) .

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.

The combustion of butane (C_(4)H_(10)) is exothermic by 2878.7 kJ "mol"^(-1) .Calculate the standard enthalpy of formation of butane given that the standard enthalpies of formation of CO_(2)(g) and H_(2)O(l) are -393.5 kJ "mol"^(-1) and -285.8 kJ "mol"^(-1) respectively.