Chapter 8.7 concepts and math question


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Harjas Sabharwal 1G
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Joined: Sat Jul 22, 2017 3:01 am

Chapter 8.7 concepts and math question

Postby Harjas Sabharwal 1G » Wed Jan 24, 2018 5:23 pm

When do we use U = 3/2RT and when do we use U = 5/2RT and what does each equation represent? Additionally when do we take into account translational, rotational linear and rotational non-linear energies?

Tim Foster 2A
Posts: 73
Joined: Fri Sep 29, 2017 7:07 am

Re: Chapter 8.7 concepts and math question

Postby Tim Foster 2A » Wed Jan 24, 2018 5:34 pm

U=3/2RT for monatomic gases at constant volume, while U=5/2RT for monatomic gases at constant pressure. Rotational and translational contributions come into play when dealing with diatomic or polyatomic gases, for which we observe
LINEAR MOLECULES- U= 5/2R, 7/2R (Constant volume, constant pressure)
NONLINEAR MOLECULES- U=3R, 4R (Constant volume, constant pressure)


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