Finding W Equations


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Sophia Diaz - Dis 1B
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Joined: Fri Apr 06, 2018 11:02 am
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Finding W Equations

Postby Sophia Diaz - Dis 1B » Sun Feb 03, 2019 1:43 pm

I don't understand how the equation: w = -PV is found from the integral equation with the summation of steps (the one with the derivative). Can someone please explain where w = -PV comes from?

Follow up question: how does w = -PV relate to the the equation U = H - PV?

Melody P 2B
Posts: 35
Joined: Fri Sep 29, 2017 7:06 am

Re: Finding W Equations

Postby Melody P 2B » Sun Feb 03, 2019 2:43 pm

Hi! So the reason we ended up back with is because we were working with the DEFINITE integral which is basically VFINAL-VINITIAL which is just
Keep in mind though that this is only when pressure is constant.
The derivative/integral was used for the reversible reaction example he discussed in class because the system was expanding VERY slowly and was doing MORE work.

As for your second question
is but q and w are substituted for q= and

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