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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 molecues was 0.2. The value of n is :
Option: 1
3

Option: 2
5

Option: 3
2

Option: 4
4

Answers (1)

best_answer

$\begin{array}{l} \alpha=\frac{n(i-1)}{(1-n)} \cdot \begin{array}{l} \alpha-0.2 \\ i=0.9 \end{array} \\ n=2 \end{array}$

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Rakesh

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