## Concepts and Equations

$\Delta U=q+w$

Jesse_torres2H
Posts: 41
Joined: Thu Jul 27, 2017 3:00 am

### Concepts and Equations

Is there a specific reason the equation H=U-PV is not on the constants and equations sheet? Should we just simply memorize this?

YashDeshmukh1D
Posts: 42
Joined: Fri Sep 29, 2017 7:05 am

### Re: Concepts and Equations

This formula is essentially a derivation of the original formula deltaH=q+w. By plugging in deltaU and PdeltaV, it is possible to achive the given formula.

Alvin Tran 2E
Posts: 39
Joined: Fri Sep 29, 2017 7:06 am

### Re: Concepts and Equations

It should be a positive sign in the equation you gave, but you can get this equation from ΔU = q + w which is on the constants and equations sheet. Under constant pressure, ΔU = qp + w. qp = ΔH and w = -PΔV. If you plug those in and rearrange, you get the equation ΔH = ΔU + PΔV.

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