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Question

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


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