## 8.51

Alexandria Weinberger
Posts: 51
Joined: Fri Sep 29, 2017 7:03 am

### 8.51

When finding the enthalpy of the reaction, why are the individual enthalpies for N2 and O2 not included in the calculation?

Cam Bear 2F
Posts: 60
Joined: Thu Jul 27, 2017 3:01 am

### Re: 8.51

N2 and O2 are in their most stable form so their enthalpies of formation are zero.

Michael Cheng 1C
Posts: 51
Joined: Thu Jul 13, 2017 3:00 am

### Re: 8.51

so when finding the enthalpy of reaction, is it just the sum of enthalpy of formation of products - sum of enthalpy of formation of reactants?

Cam Bear 2F
Posts: 60
Joined: Thu Jul 27, 2017 3:01 am

### Re: 8.51

Don't forget to multiply by the moles
$\Delta H=\sum nH^{\circ }_{f products}-\sum nH^{\circ }_{f reactants}$
Which is the energy per mole of reaction

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