## Total internal energy calculation(Utotal)

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Marni Kahn 1A
Posts: 107
Joined: Thu Jul 25, 2019 12:17 am
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### Total internal energy calculation(Utotal)

is the equation U(total)=(3/2)n*R*T only used when there has been an isothermal reversible expansion reaction?

Harry Zhang 1B
Posts: 101
Joined: Sat Sep 14, 2019 12:16 am

### Re: Total internal energy calculation(Utotal)

The change of internal energy of a system is zero in isothermal expansion. This formula is related to the equipartition theory and can be used to calculate the internal energy of molecules or atoms by taking into account rotational and translational energy.