Calculate the standard enthalpy of formation of liquid benzene `(C_(6)H_(6))`. Given the enthalpies of combustion of Carbons (s), Hydrogen (g) and Benzene (I) are -393.5kJ, -285.83kJ and -3267.0 respecitvely.

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.

The standard entropy change Delta S_r^@ for CH_(4(g)) + 2O_(2(g)) to CO_(2(g)) + 2H_2O_((l)) is -242.98 JK^(-1) at 25^@C . Calculate the standard reaction enthalpy for the above reaction if standard Gibbs energy of formation of CH_(4(g)), CO_(2(g)) and H_2O_((l)) are -50.72, -394.36 and - 237.13 kJ mol^(-1) respectively.

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.

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) .

Calculate standard free energy of formation of H_2O_((l)) . The standard enthalpy of formation of H_2O_((l)) is 285.85 kJ and standard entropies of H_(2(g)), O_(2(g)) and H_2O_((l)) are130.5, 205.0 and 70.3 J. K^(-1) "mole"^(-1) respectively.