Work Equations


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Taylor_Lam_1E
Posts: 9
Joined: Wed Sep 21, 2016 2:58 pm

Work Equations

Postby Taylor_Lam_1E » Tue Feb 14, 2017 9:44 pm

Hi. I'm kind of confused between ln and log in work equations. When do you know to use w = -nRT ln (vfinal / vinitial) and when to use w = -2.303nRT log (vfinal/ vinitial)? For example, in the book page 310, 8.27. The question says to calculate work for a gas sample with T = 305 K, P= 1.79 atm, and V = 4.29L for a isothermal, reversible expansion to a final volume of 6.52L. Thanks

Logan 3C
Posts: 22
Joined: Wed Sep 21, 2016 2:57 pm

Re: Work Equations

Postby Logan 3C » Tue Feb 14, 2017 9:52 pm

As far as I can tell, its best to stick with -nRTln(v2/v1). Thats the equation Lavelle uses the most on tests and quizzes so thats probably the safest bet

Drake_Everlove_1K
Posts: 19
Joined: Sat Sep 24, 2016 3:02 am

Re: Work Equations

Postby Drake_Everlove_1K » Sun Feb 26, 2017 3:00 pm

ln and log have to do with whether or not pH is being used (pH is measured in log) so it shouldn't be very necessary to use the log equation, but I don't think it gives a different answer.


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