Calculating Work


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Eileen Si 1G
Posts: 120
Joined: Fri Aug 30, 2019 12:17 am

Calculating Work

Postby Eileen Si 1G » Mon Jan 27, 2020 10:00 pm

When would you know to use w=-P*delta V versus w=-nRTln(V2/V1) to calculate work of expansion? (Like in homework 4A.5)

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

Re: Calculating Work

Postby Justin Sarquiz 2F » Wed Jan 29, 2020 8:37 am

Lavelle has not gone over this topic yet because he is starting on thermochemistry first and then going to thermodynamics. I am guessing that you would use the equation according to the information given in the problem.

Sean Cheah 1E
Posts: 105
Joined: Wed Sep 18, 2019 12:20 am

Re: Calculating Work

Postby Sean Cheah 1E » Wed Jan 29, 2020 9:07 am

Use the first equation for irreversible expansions/contractions occurring against constant external pressure. Use the second equation for reversible expansions where the external pressure is always equal to the internal pressure (pressure of the expanding/contracting gas).

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