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Define standard enthalpy of formation ....

Define standard enthalpy of formation .

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Explain standard enthalpy of formation (Delta_(f)H^(@)) .

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 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

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 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.

The enthalpy of combustion of one mole of benzene,carbon and hydrogen are-3267 kj mol-1 ,-393.5 kj mol^-1 and -285.8 kj mol^-1 respectively.Calculate the stnadard enthalpy of formation of benzene.