If enthalpy of combustion of carbon, hydrogen and `C_(3)H_(8)" are "x_(1),x_(2) and x_(3)"per "mol^(-1)` respectively , then the enthalpy of formation of `C_(3)H_(8)` will be

If the enthalpy of combustion of benzene (l), carbon (s) and hydrogen (g)are Q_(1) Q_(2)and Q_(3) respectively, what will be enthalpy of formation of Benzene?

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 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 enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283.0 kJ mol^(-1) respectively. The enthalpy of formation of carbon monoxide is :

The enthalpies of combustion of carbon and carbon monoxide are -390 kJ mol^(-1) and -278 kJ mol^(-1) respectively. The enthalpy of formation of carbon monoxide is

The enthalpies of combustion of carbon and carbon monoxide are -390 KJ mol^(-1) and -278 KJ mol^(-1) respectively. The enthalpy of formation of carbon monoxide is