The standard enthalpy of formation of `C_(2)H_(4)(l)`, `CO_(2)(g)` and `H_(2)O(l)` are `52`, `394` and `-286 kJ mol^(-1)` respectively. Then the amount of heat evolved by burning `7g` of `C_(2)H_(4)(g)` is

The standard heat of formation of CH_(4)(g), CO_(2)(g) and H_(2)O(g) are -76.2, -394.8 and -241.6 kJ mol^(-1) respectively. Calculate the amount of heat evolved by burning 1 m^(3) of methane measured at N.T.P.

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

Standard heat of formation of CH_(4),CO_(2) and H_(2)O_((g)) are -76.2,-394.8 and -241.6kJ mol^(-1) respectively. Calculate the amount of heat evolved by burning 1m^(3) of CH_(4) measured under normal conditions.

Standard heat of formation of CH_(4),CO_(2) and H_(2)O_((g)) are -76.2,-394.8 and -241.6kJ mol^(-1) respectively. Calculate the amount of heat evolved by burning 1m^(3) of CH_(4) measured under normal conditions.

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 are 52, -394 and -286 KJ mol^(-1) respectively. The entahlpy of combustion of C_(2)H_(4) will be :-

At 25^(@)C and 1 atm, heat of formation of C_(2)H_(4) (g), CO_(2)(g) and H_(2)O(l) are 52 " kJ mol"^(-1), -394 " kJ mol"^(-1) and -286 " kJ mol"^(-1) respectively. Calculate the heat of combustion of C_(2)H_(4)(g) .

If enthalpies of formation of C_(2)H_(4)(g)1 ,CO_(2) and H_(2)O(l) at 25(@)C and 1 atm pressure be 52,-394 and -286kJmol^(-1) respectively ,the enthalpy of combustion of C_(2)H_(4)(g) will be