enthalpy equations

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Savannah Mance 4G
Posts: 107
Joined: Fri Aug 30, 2019 12:17 am

enthalpy equations

Postby Savannah Mance 4G » Tue Feb 04, 2020 10:26 pm

For 4D.5 why is the change in enthalpy equal to the heat supplied if there was expansion work done? I thought there had to be no expansion for the change in enthalpy to equal q.

Ruby Tang 2J
Posts: 102
Joined: Fri Aug 30, 2019 12:15 am

Re: enthalpy equations

Postby Ruby Tang 2J » Tue Feb 04, 2020 11:34 pm

ΔH is equal to q whenever the reaction is occurring at constant pressure, a condition which is specified in the problem. I think you may be referring to the fact that there has to be no expansion in order for ΔH to be equal to ΔU (internal energy). Hope this helps!


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