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A molecule M associates in a given solve...

A molecule M associates in a given solvent according to the equation `M hArr (M)_(n)`. For a certain concentration of M, the van't Hoff factor was found to be `0.9` and the fraction of asscoiated molecules was `0.2`. The value of n is:

A

2

B

4

C

5

D

3

Text Solution

Verified by Experts

The correct Answer is:
A
`alpha=(n(i-1))/((1-n)) ._(i=0.9)^(alpha =0.2)`
`n = 2`
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