Question about Internal Energy

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AGaeta_2C
Posts: 112
Joined: Wed Sep 18, 2019 12:21 am

Question about Internal Energy

Postby AGaeta_2C » Sun Feb 02, 2020 9:29 pm

Why is ΔU equal to ΔH only when pressure is constant and volume doesn't change?
Is this relationship shown through any of the equations we have been working with?

AGaeta_2C
Posts: 112
Joined: Wed Sep 18, 2019 12:21 am

Re: Question about Internal Energy

Postby AGaeta_2C » Sun Feb 02, 2020 9:35 pm

Actually, is this line of thinking correct?:
The change in internal energy (ΔU) is equal to the change in enthalpy (ΔH) because there is no energy being done through work (w).
ΔU= qp + w
ΔU = ΔH + (-PΔV)
ΔU = ΔH + 0
ΔU = ΔH

Jesalynne 2F
Posts: 100
Joined: Wed Sep 18, 2019 12:18 am

Re: Question about Internal Energy

Postby Jesalynne 2F » Sun Feb 02, 2020 9:59 pm

Yes, I believe your line of thinking is correct. :) That is what I have in my notes.


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