Question

Substance M in a solvent undergoes trimerisation completely. Vant Hoff factor of M in the solution is

Answer 1

Given:

Substance M in a solvent undergoes trimerisation completely.

To find:

Vant Hoff factor of M in the solution is

Solution:

If a fraction α of n moles of solute associate to form one mole of an trimer, then, we have,

i = 1 - (1 - 1/n) α

From given, we have,

Substance M in a solvent undergoes trimerisation completely.

⇒ n = 3

⇒ α = 1

i = 1 - (1 - 1/3) (1)

i = 1 - 1 + 1/3

∴ i = 1/3

Hence, the van't Hoff factor of M in the solution is 1/3.