Enthalpy of combustion of benzene is `-3267 kJ mol^(-1)`. Calculate enthalpy of formation of benzene, given enthalpy of formation of `CO_(2)` and water are `- 393.5 kJ mol^(-1)` and `-285.83 kJ mol^(-1)`.

The enthalpy of vaporisation of water is 186.5 kJ mol^(-1) . The entropy of its vaporisation will be :

Calculate the enthalpy of vapourisation of ethanol, given enthalpies of formation of liquid ethanol and gaseous ethanol as -277.6J and -235.4 kJ respectively.

Calculate the standard enthaly of formation of Methane. Given that the standard enthalpy of combustion of Methane, carbon and Hydrogen are -893.3kJ, -3.93kJ and -285.8kJ respectively.

Heat of neutralisation of a weak acid HA by NaOH is -"12.13 kJ mol"^(-1) . Calculate the enthalpy of ionization of HA.

From the data given below at 298 K for the reaction : CH_(4)(g) + 2O_(2)(g) rarr CO_(2)(g) + 2H_(2)O(l) Calculate the enthalpy of formation of CH_(4)(g) at 298 K. Enthalpy of reaction is = -893.5 kJ Enthalpy of formation of CO_(2)(g) = 393. kJ mol^(-1) Enthalpy of formation of H_(2)O(l) = 286.0 kJ mol^(-1) .

The standard enthalpy of formation of NH_(3) is - 46.0 kJ mol^(-1) . If the enthalpy of formation of H_(2) from its atoms is - 436 kJ mol^(-1) and that of N_(2) is - 712 kJ mol^(-1) , the average bond enthalpy of N - H bond is NH_(3) is

The enthalpy of combustion of carbon to CO_(2)(g) is -393.5 kJ mol^(-1) . The heat released upon the formation of 35.2 g of CO_(2) from carbon and dioxygen 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 :