## Enthalpy Units

$\Delta U=q+w$

Laine Gruver 3C
Posts: 19
Joined: Wed Sep 21, 2016 2:56 pm

### Enthalpy Units

I noticed in some of the textbook problems that for enthalpy, they seem to use both kJ/mol and kJ interchangeably. Can anyone help explain this to me?

Preston_Dang_1B
Posts: 22
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Enthalpy Units

When the units are just kJ, it usually is written at the end of a reaction on the same line and it's implied that value of enthalpy is the change in energy for one "mole" of reaction. For example, if you were to double the amount of reactants/products, it would use twice the amount of enthalpy, and so on. If it's written as kJ/mol, it's usual for individual molecules/compounds and the various types of enthalpies associated with individual molecules (heat of vaporization, heat of fusion, q = mc$\Delta$T, etc.)