Question

Which of the following can be the value of “b” for Helium?

(a) 23.71 x 10^-6 m^2/mol

(b) 23.71 x 10^-6 m^3/mol

(c) 23.71 x 10^-6 m^3 mol

(d) 23.71 x 10^-6 m/mol

This question was addressed to me by my college professor while I was bunking the class.

My question is based upon States of Matter topic in portion States of Matter of Chemistry – Class 11

Answer 1

Correct answer is (b) 23.71 x 10^-6 m^3/mol

The best explanation: From van der Waal’s equation (P – an^2/V^2)(V – nb) = nRT, we have that units of volume and number of moles x b are same. So L = mol x b; units of b is L/mol otherwise can be written as m^3/mol.