Different work problems?


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Juanalv326
Posts: 49
Joined: Fri Sep 29, 2017 7:04 am

Different work problems?

Postby Juanalv326 » Mon Mar 12, 2018 9:41 pm

When would we know when to use the different work equations such as -PDV or -nRTlnV2/V1 or DU. How would we be able to deduce one equation from a problem per se.

Nicole 1F
Posts: 31
Joined: Fri Sep 29, 2017 7:05 am

Re: Different work problems?

Postby Nicole 1F » Mon Mar 12, 2018 10:14 pm

You would use w=-PΔV for an irreversible pathway and -nRTlnV2/V1 for a reversible pathway. You solve for ΔU normally using ΔU = w +q

804899546
Posts: 51
Joined: Sat Jul 22, 2017 3:00 am

Re: Different work problems?

Postby 804899546 » Fri Mar 16, 2018 9:52 pm

You would use w=-Pext(deltaV) when pressure is constant, and w=-nRTln(V2/V1) when pressure is changing as well.


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