## enthalpy

$\Delta U=q+w$

Kaylee Yan 4C
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

### enthalpy

under what conditions does q=delta H?
and how would you use it in an equation?

Richmund Tan 1L
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

### Re: enthalpy

q only equals delta H when the reaction is occurring at a constant pressure that involves solids and/or liquids. This is because P times delta V is insignificant due to the constant pressure and the volume of the reactants equals the volume of the products.