SATHEE: Solutions Question 346

Solutions Question 346

Question: A molecule M associates in a given solvent according to the equation $M \to {(M)}_{n}$ . 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:

A) 3

B) 5

C) 2

D) 4

Show Answer

Answer:

Correct Answer: C

Solution:

van ’t Hoff factor (i) and the degree of association are related as below: $i = 1 - α (1 - \frac{1}{n})$

$0.9 = 1 - 0.2 (1 - \frac{1}{n})$ On solving, $(1 - \frac{1}{n}) = \frac{1}{2}$

$\frac{1}{n} = 1 - \frac{1}{2} = \frac{1}{2}$
$∴ n = 2$

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Solutions Question 346

Question: 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:

Answer:

Solution:

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Question: A molecule M associates in a given solvent according to the equation $M \to {(M)}_{n}$ . 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: