Constant pressure and delta U

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Emily Glaser 1F
Posts: 156
Joined: Thu Jul 27, 2017 3:01 am

Constant pressure and delta U

Postby Emily Glaser 1F » Mon Mar 12, 2018 4:10 pm

In Example 8.6 in the in-chapter problems, I don't understand their reasoning for using Cv in the constant pressure problem.

Why does delta U = nCvdeltaT for the delta U of a reaction at constant pressure?

Lena Nguyen 2H
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am
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Re: Constant pressure and delta U

Postby Lena Nguyen 2H » Mon Mar 12, 2018 7:50 pm

Delta U = nCvdeltaT is used to find the heat at constant volume (w = 0), so the use of Cv is appropriate. Although this equation is used in part (b) with constant pressure, finding delta U is broken into two steps, one of which heats at constant volume.

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