A molecule M associates in a given solvent according to the equation

Question:

A molecule $M$ associates in a given solvent according to the equation $M \rightleftharpoons(M)_{n}$. For a certain concentration of M, the van't Hoff factor was found to be $0.9$ and the fraction of associated molecules was $0.2$. The value of $\mathrm{n}$ is :

 

  1. 2

  2. 4

  3. 5

  4. 3


Correct Option: 1

Solution:

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