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.

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.

The enthalpy of combustion of graphite and diamond are -393.5 kJ and -395 kJ respectively. Which of them is more stable ?

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 enthalpy of combustion of ethylene at 300K at constant pressure if its enthalpy of combustion at constant volume is -"1406 kJ mol"^(-1) .

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 the standard emf of the cell having the standard free energy change of the cell reaction is -64.84 kJ for 2 electrons transfer.

What do you understand by the following statements ? enthalpy of combustion of carbon disulphide is = -1065.2 kJ.

The standard entropy change for the reaction C_3H_(6(g)) + 9/2O_(2(g)) to 3CO_(2(g)) + 3H_2O_((l)) is – 339.23 JK-1 at 25^@C . Calculate the standard reaction enthalpy change if the standard Gibbs energy of formation of C_3H_(6(g)), CO_(2(g)) and H_2O_((l)) are 62.78, – 394.36 and –237.13 kJ. "mol"^(–1) respectively.