Standard Enthalpy of Formation Course Reader example

[Jamie_Cole_2N]

On page 17 of the course reader, there is a standard enthalpy of formation example about using graphite and gaseous hydrogen and oxygen to form ethanol,
Why is the enthalpy of reaction divided by 2?

[April Z 1K]

The standard reaction enthalpy is divided by 2 because the example is looking for the formation of 1 mole of CH3CH2OH, whereas the rxn enthalpy gives the kJ amount for 2 moles of CH3CH2OH. Hope this helps.