## 8.57

$\Delta U=q+w$

veneziaramirez 3I
Posts: 57
Joined: Fri Sep 29, 2017 7:07 am

### 8.57

How do we know which balanced equations to use for the reaction given? Where do the equations from the solutions manual come from?

Ishan Saha 1L
Posts: 60
Joined: Fri Sep 29, 2017 7:03 am

### Re: 8.57

Hi, this is just an example of Hess' Law where we add the reactions together to get the final overall balanced overall reaction and the overall reaction enthalpy. I do not think we will be expected to know the balanced equations of formations of compounds without any information given to us on the final.