Enthalpy at a constant pressure vs at a constant volume

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Sara Richmond 2K
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Enthalpy at a constant pressure vs at a constant volume

Postby Sara Richmond 2K » Tue Jan 28, 2020 12:29 pm

What are the different formulas for calculating enthalpy at a constant pressure vs calculating enthalpy at a constant volume.
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Benjamin Feng 1B
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Joined: Sat Sep 07, 2019 12:19 am

Re: Enthalpy at a constant pressure vs at a constant volume

Postby Benjamin Feng 1B » Tue Jan 28, 2020 12:41 pm

For constant volume, you are calculating delta U instead of H, which is the change in internal energy, and to convert between the 2, you use the equation ΔH=qv+ΔngRT. For constant pressure, you can just use the equation ΔH=qv= ΔT*Csp*m
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