## ΔU = ΔH for biological reactions

$\Delta U=q+w$

Ashley Garcia 2L
Posts: 33
Joined: Fri Sep 29, 2017 7:05 am

### ΔU = ΔH for biological reactions

Why does ΔU = ΔH in most biological reactions if ΔU = q + w? Why don't we account for work when calculating the change internal energy (ΔU).

Hannah Guo 3D
Posts: 56
Joined: Fri Sep 29, 2017 7:06 am

### Re: ΔU = ΔH for biological reactions

Since w=-P deltaV and there is no change in volume in the biological system, deltaV=0 and therefore w=0.

Posts: 51
Joined: Fri Sep 29, 2017 7:07 am
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### Re: ΔU = ΔH for biological reactions

Same can also be said about pressure as a cell in the body doesn’t change pressure so w=0 in that case. Making $\epsil\bigtriangleup U=\bigtriangleup H$.