Constant Pressure of Krypton (4c.3 7th Edition)

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Henry Krasner 1C
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Constant Pressure of Krypton (4c.3 7th Edition)

Postby Henry Krasner 1C » Mon Jan 28, 2019 3:49 pm

How are we supposed to calculate the pressure and volume constant of Krypton?
Specifically where does the (5/2) x 8.314 J.mol.K come from for the constant pressure for example?

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Re: Constant Pressure of Krypton (4c.3 7th Edition)

Postby Chem_Mod » Mon Jan 28, 2019 5:38 pm

Krypton is a monatomic gas, so assuming it is an ideal gas, its heat capacity at constant volume will be 3 x R.
CP = CV + R for an ideal gas, so CP = R + R = R
R = 8.3145

This is because each translational degree of freedom contributes R and each rotational degree of freedom contributes R to CV. Kr has three translational degrees of freedom and no rotational degrees of freedom.


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