Winter Final 2012 2C


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Winter Final 2012 2C

Postby KaylaH » Wed Mar 09, 2016 4:40 pm

In part c of question 2 dealing with He heated up to 100 degrees, can someone please explain why Cv is used for the ideal gas and not Cp?

Juan Torres Dis 2D
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Re: Winter Final 2012 2C

Postby Juan Torres Dis 2D » Wed Mar 09, 2016 9:03 pm

According to the problem, the Helium gas is heated up in the non-expandable case up to 100 degrees before it is allowed to leak out. Since the case is non-expandable, the volume is constant and you thus use Cv instead of Cp. During the heating process, since the volume is constant, the pressure is going to increase and is thus not constant.

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