Question

In van der Waal’s equation of state of the gas law, the
constant ‘b’ is a measure of
(a) volume occupied by the molecules
(b) intermolecular attraction
(c) intermolecular repulsions
(d) intermolecular collisions per unit volume

Answer 1

Answer:

b) intermolecular attraction

Answer 2

In van der waals equation of the gas law, the constant 'b' is a measure of volume occupied by the molecule.

Explanation:

van der Waal states that n mole of ideal gas occupying volume (V) will have a pressure (P) and temperature (T).R is the universal gas constant.

The equation is, PV=nRT

A second modification takes place which depicts that attraction does't takes place in ideal gas molecules but attraction takes place in case of real gas.

Thus 2nd equation is -

$(P+\alpha \frac{1}{V} ) (V_{m} -b)=RT$

where, $V_{m}$ is the molar volume,R= universal gas constant,T= temperature,P=Pressure,b=volume that is occupied by the one mole of molecule.