## Example 8.7

Kassandra Molina 2B
Posts: 43
Joined: Wed Nov 16, 2016 3:03 am

### Example 8.7

Why is the equation to figure the change in enthalpy $\Delta H$ =(2mol)*q/n ? I understand the 2 mol comes from benzene but why do we have to do q/n?

Thuy-Anh Bui 1I
Posts: 56
Joined: Sat Jul 22, 2017 3:00 am
Been upvoted: 2 times

### Re: Example 8.7

The units for ΔH are Joules. If you are trying to find the change in enthalpy (ΔH) for 2 mol of benzene, you need to multiply by q (J) in the numerator and n (mol) in the denominator to end up with the ΔH in Joules.

$\Delta H = \frac{(2 mol)\cdot (-8.60\cdot 551J)}{(0.113/78.12 mol)} = -6.55 \textrm{x} 10^{6} J$