The standard molar heats of formation of ethane, carbon dioxide, and liquid water are `-21.1, -94.1`, and `-68.3kcal`, respectively. Calculate the standard molar heat of combustion of ethane.

The standard molar heats of formation of ethane, carbon dioxide, and liquid water ate -21.1, -94.1 , and -68.3kcal , respectively. Calculate the standard molar heat of combustion of ethane.

The standard molar enthalpy of formation of ethane, carbon dioxide and liquid water are -21.1, -91.1 and -68.3 kcal respectively. Calculate the standard enthalpy change of the following reaction : 2C_(2)H_(5)(g) + 7O_(2)(g) to 4CO_(2)(g) + 6H_(2)O(l) .

The heat of formation of ethane is -19.46 kcal . Bond enegries of H-H, C -H and C- C bonds are 104.18, 99.0 and 80.0 kcal , respectively. Calculate the heat of atomisation of graphite.