Question

the unit of 'a' in van der waal's equation.
A) Atom litre -² mole -²
B) Atom litre mole -¹
C) Atom litre mole -²
D) Atom litre ²mole-¹

Answer 1

Hey,

the unit of van der Waal's constant 'a' is atm litre² mole^-1.

kindly don't read atm as atom.They are different

Regards

KSHITIJ

Answer 2

As real gas equation is

( P + an^2/V^2) ( V- nb) = nRT

As Here Pressure (P) is added to an^2/V^2
that means an^2/V^2 will have unit of pressure

As P = a n^2/v^2 in terms of unit

a = P V^2/n^2

P has unit atm

V = litre
n = mole

So a = atm litre^2 mole^-2

So A option should be atm litre ^2 mole^-2