First slide

Gaseous state

Question

In terms of critical constants, compressibility factor is

Moderate

A

1
B

$\frac{3}{4}$
C

$\frac{3}{7}$
D

$\frac{3}{8}$

Solution

for an ideal gas Compressibility factor ( Z )=1 ;
Z= PV / nRT
Z = Pc Vc/nRTc
Pc =a /27b²
Vc= 3b
Tc= 8a/27bR
therefore Z = 3/8

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