A student performed an experiment to measure the enthalpy change of combustion of ethane.
He used the following values for the standard enthalpy changes of combustion of carbon and hydrogen.
carbon = –394 kJ mol–1 hydrogen = –286 kJ mol–1
He calculated the enthalpy change of formation of ethane to be –140 kJ mol–1.
What was his experimental value for the standard enthalpy change of combustion of ethane?