Heat of formation of `H_2 O_((l)), CO_(2(g)) "and" C_2 H_(4(g))` are `-285.0, -399.0,` and 69.9 kJ/mole respectively. The heat of combustion of ethylene is _________ .

Heat of formation of CO_(2)(g), H_(2)O(l) and CH_(4)(g) are -94.0, -68.4 and -17.9 kcal respectively. The heat of combustion of methane is

The heats of formation of CO_2, H_2O and C_2H_4 are -94.05, -68.2 and 12.6 K.Cals/ mole, respectively. The heat of combustion of ethylene is

The heats of formation of C_(6)H_(6)(l),H_(2)O(l) and CO_(2)(g) are 11.70,-68.4 and -94.0 kcal respectively. Calculate the heat of combustion of benzene (l).

The heats of combustion of C_(2)H_(4(g)), C_(2)H_(6(g)) and H_(2(g)) are -1405,-1558.3 and -285.6 kJ respectively. Calculate heat of hydrogenation of ethylene.

The heats of formation of CO_(2(g)) and H_(2)O_((l)) are - 398 and -285 kJ mol^(-1) respectively. The heat of combustton of methane is -390 kJ. The heat of formation of methane will be

Heat of formation of CO_(2)(g),H_(2)O(l)andCH_(4)(g)"are"-94,-68.4 and-17 .9 "kCal" " mol"^(-1) respectively, the heat of combustion of CH_(4)(g) is :-