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Question

What is dimensions of a in van der Waals' equation?

A
[ML1T2]
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B
[ML5T2]
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C
[ML3T2]
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D
[M2L3T2]
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Solution

The correct option is B [ML5T2]
Principle of homogeneity of dimensions and only like quantities can be added or subtracted from each other.
van der Waals' equation is
(p+aV2)(Vb)=RT
Here,
Dimensions of aV2= Dimensions of p,
Dimensions of a= Dimensions of [pV2]
=[ML1T2][L3]2
=[ML5T2]

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