Discussion Forum



1)

At low pressure, the van der Waal's equation is reduced to


A) $Z = \frac{PV_{m}}{RT} = 1-\frac{a}{VRT}$

B) $Z = \frac{PV_{m}}{RT} = 1+\frac{b}{RT}P$

C) $PV_{m} = RT$

D) $Z = \frac{PV_{m}}{RT} = 1-\frac{a}{RT}$

Answer:

Option A

Explanation:

When pressure is low

$\left[P+\frac{a}{V^{2}}\right](V-b) = RT$

OR $Z = \frac{PV_{m}}{RT} = 1-\frac{a}{VRT}$

Z = $\frac{-a}{VRT}$

$\frac{PV}{RT}$ =Z