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A molecule M associates in a given solvent according to the equation M ( 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 n is:

Options

  1. A3
  2. B5
  3. C2
  4. D4

Correct answer

C. 2

Step-by-step solution

van't Hoff factor (i) and the degree of association are related as below : aligned & i=1- (1- 1 n ) & 0.9=1-0.2 (1- 1 n ) aligned On solving, aligned & (1- 1 n )= 1 2 & 1 n =1- 1 2 = 1 2 & n=2 aligned

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