Chemistry | VITEEE 2019 | Discussion Page

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)

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

Option A

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

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