standard reaction enthalpy

[Katie Bart 1I]

When you find the standard reaction enthalpy for a reaction, is the value in units of kJ or kJ/mol? I've seen both used in the textbook.

[Skyllar Kuppinger 1F]

If it asks you for the standard enthalpy of a reaction then it will be in kj bc you can't really have moles of a reaction. If it's the standard enthalpy of FORMATION then it is kj/mol bc that is the enthalpy change that occurs when one mole of that molecule is formed.

[Caitlyn Tran 2E]

If it is standard reaction enthalpy, it may say kJ or kJ/mol, but it is implied that the standard reaction enthalpy given is for one "mole" of reaction. You can't really have a mole of a reaction, so this just means that the given standard reaction enthalpy is the enthalpy proportional to the moles of each compound given. If you multiply the reaction by a coefficient of 2, you will have to multiply the standard reaction enthalpy by 2 as well. It follows the same rules as used in Hess's Law. Hope this helps!

[IScarvie 1E]

Both are acceptable, however Standard Enthalpy of Formation is required to be in kJ/mol.