Describe5 marksStandard
A student has data for the standard enthalpy changes of combustion of carbon (graphite), hydrogen and ethane. She wants to use these values, together with Hess's law, to determine the standard enthalpy change of formation of ethane without doing a direct experiment.
Describe, in words, how the combustion enthalpy values can be used to obtain the enthalpy change of formation of ethane. Include in your answer the basis of Hess's law and the substances involved in the energy cycle. Do not carry out any calculation.