Calculate the ethalpy of combustion of ethylene (g) to form `CO_(2)` (gas) and `H_(2)O` (gas) at 298 K and 1 atmospheric pressure. The enthalpies of formation of `CO_(2),H_(2)O` and `C_(2)H_(4)` are `-393.7, -241.8+52.3` kJ per mole respectively.

Calculate the heat of combustion of 1 mole of C_(2)H_(4)(g) to form CO_(2)(g) and H_(2)O(g) at 398K and 1 atmosphere, given that the heats of formation of CO_(2)(g),H_(2)O(g) and C_(2)H_(4)(g) are -94.1,-57.8 and +12.5kcal" "mol^(-1) 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 standard enthalpy of formation of ethylene, C_(2)H_(4)(g) from the following thermochemical equation : C_(2)H_(4)(g) + 3O_(2)(g) to 2CO_(2)(g) + 2H_(2)O(g) Delta_(r)H^(@) = -1323 kJ Given the standard enthalpy of formation of CO_(2)(g) and H_(2)O(g) are - 393.5 and -249 kJ mol^(-1) respectively.

From the following data, calculate the enthalpy change for the combustion of cyclopropane at 298K . The enthalpy of formation of CO_(2(g)),H_(2)O_((l)) and Propen e_((g)) are -393,-285.8 and 20.42 kJ mol^(-1) respectively. The enthalpy of isomerisation of cyclopropane to propene is -33.0kJ mol^(-1)

From the following data, calculate the enthalpy change for the combustion of cyclopropane at 298K . The enthalpy of formation of CO_(2(g)),H_(2)O_((l)) and Propen e_((g)) are -393,-285.8 and 20.42 kJ mol^(-1) respectively. The enthalpy of isomerisation of cyclopropane to propene is -33.0kJ mol^(-1)