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What are the units of “b” in van der Waals equation?

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in Chemistry – Class 11 by (148k points)
What are the units of “b” in van der Waals equation?

(a) L/mol

(b) L mol

(c) 1/L mol

(d) L

I had been asked this question during an interview.

The origin of the question is States of Matter topic in chapter States of Matter of Chemistry – Class 11

1 Answer

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Correct choice is (a) L/mol

To explain: The ideal gas equation is given as (P – an^2/V^2)(V – nb) = nRT.  So by considering the equation, we can understand that the units of the volume are equal to the units of a number of moles X be so the units of b. So b’s units = volume / number of moles so it is L/mol.

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