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Compressibility Factor

The compressi...

Question

The compressibility factor for a van der Waal’s gas at the critical point is:

A

zero

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B

0.4

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C

0.375

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D

0.25

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Solution

The correct option is C
0.375

Compressability factor $z = \frac{P V}{R T}$
$P_{c} V_{c} = \frac{3}{8 R T_{c}}$
$=> z = 3 / 8 = 0.375$

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