The van der Waals constant `b` is realted to the volume occupied by the molecules of a gas. It is known as the excluded volume by the molecules of a gas. It is known as the excluded volume or noncompressible volume of the gas. It is equal to ……… times the actual volume of one mole of gas molecules.

Options

A. three
B. four
C. five
D. two

Answer

B

Explanation

`b = (4)(4//3 pi r^(3))N_(o)`
where `r` is the radius of gas molecule and `N_(o)` is Avogadro's constant. Hence, there is a enough correlation between the molecular size and `b`. Generally , the larger the molecule (or atom), the greater the value of `b`.