Calculate the standard enthalpy of combustion of `CH_(4)`, it standard enthalpies of formation of `CH_(4(g)),H_(2)O_((l)),` and `CO_(2(g))` are `-74.81kJ mol^(-1), -285.83kJ mol^(-1)` and `-393.51kJ 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.

The combustion of 1 mole of benzene takes place at 298K and 1 atm. After combustion, CO_(2(g)) and H_(2)O_((l)) are produced and 3267.0 KJ of heat is liberated. Calculate the standard enthalpy of formation, Delta_(f)H^(0) of benene. Standard enthalpies of formation of CO_(2(g))andH_(2)O_((l)) are -393.5 KJ mol^(-1) and - 285.83 KJ mol^(-1) respectively

Calculate the standard enthalpy change for the reaction CH_4(g) +2O_2(g) rarr CO_2(g)+2H_2O(l) Given that the standard enthalpies of formation of CH_4(g),CO_2(g), and H_2O(l) are -74.8 kJ mol^-1, -393.5 kJ mol^-1 and -285.8 kJ mol^-1 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 enthalpy change for the reaction CH_(4)(g) + 2O_(2)(g) to CO_(2)(g) + 2H_(2)O(l) The enethalpy of formation of CH_(4)(g),CO_(2)(g) and H_(2)O(l) are -74.8 kJ mol^(-1) , -393.5 kJ mol^(-1) and -285.8 kJ mol^(-1) respectively.

The combustion of one mole of benzene takes place at 298 and 1 atm. After combustion, CO_(2)(g) and H_(2)O(l) are produced and 3267.0 kJ of heat is liberated. Calculate the standard enthalpy of formation. triangle_f H^@ benzene. Standard enthalpies of formation of CO_2(g) and H_20(l) are -393,5 kJ mol ""^(-1) and "-285.83 kJ mol"^(-1) respectively.

The heats of formation of CO_(2(g)) , H_2O_((l)) and CH_(4(g)) are respectively –394 kJ mol^(-1), -286 kJ mol^(-1) and -76 kJ mol^(-1) . Calculate the heat of combustion of methane.

The heat of formations for CO_(2)(g),H_(2)O(l) and CH_(4)(g) are -400 kJ mol^(-1),-280" kJ "mol^(-1) and -70" kJ "mol^(-1) , respectively. The heat of combustion of CH_(4) in kJ mol^(-1) is