Values of enthalpy changes of combustion can be used to calculate enthalpy change of formation.
The enthalpy change for the reaction in equation 2.1 is the enthalpy change of formation of propane.
3C + 4H2---------------------------> C3H8
The table below shows the enthalpy changes of combustion of carbon, hydrogen and propane.
carbon -394
hydrogen -286
propane -2219
Use these data to calculate the enthalpy change of formation
I keep getting the wrong answer to this and don't know why.
Could somebody do it with working out please