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5. Calculate the enthalpy change on the formation of methane gas from the elements, using the following data at 25C and one bar pressure: -

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5. Calculate the enthalpy change on the formation of methane gas from the elements, using the following data at 25C and one bar pressure: - Heat of combustion of carbon =393.51kJ/mol - Heat of formation of water vapor =241.82kJ/mol - Heat of combustion of methane gas to liquid water 890.36kJ/mol - Heat of vaporization of water =583.91kJ/mol Ans. 74.81kJ/mol

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