Question

# Which of the following expressions represents the value and unit of van der Waals' constant $$a$$?

A
a=Vn,L mol1
B
a=PVn,atm L2 mol1
C
a=PV2n2,atm L2 mol1
D
a=Pn,atm mol1

Solution

## The correct option is C $$a = \dfrac {PV^{2}}{n^{2}}, atm\ L^{2}\ mol^{-1}$$Van der waals equation of State is $$(P+\cfrac{n^2a}{V^2}(V-nb)=nRT$$Here, constant a is given by $$a=\cfrac{PV^2}{n^2}$$Units are $$atm-Lmol^{-1}.$$Chemistry

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