The molar enthalpies of combustion of `C_(2)H_(2)(g), C("graphite")` and `H_(2)(g)`are `-1300,-394`, and `-286 kJ mol^(-1)`, respectively. The standard enthalpy of formation of `C_(2)H_(2)(g)` is

The molar heats of combustion of C_(2)H_(2)(g),C (graphite) and H_(2)(g) are 310.62 kcal, 94.05 kcal and 68.32 kcal respectively. Calculate the standard heat of formation of C_(2)H_(2)(g) .

Molar heats of combustion of C_(2)H_(2)(g), C (graphite) and H_(2)(g) " are " -310.62 " kcal ", -94.05 " kcal " and -68.32 kcal respectively. Calculate the standard heat of formation of C_(2)H_(2)(g) .

The enthalpy of formation for C_(2)H_(4)(g) , CO_(2)(g) and H_(2)O(l) at 25^(@)C and 1 atm. Pressure be 52 , -394 and -286 kJ mol^(-1) respectively. The enthalpy of combustion of C_(2)H_(4)(g) will be