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Question: A 5 % solution of cane sugar (mol. mass = 342) is isotonic with 1 % solution of a substance X. The m...

A 5 % solution of cane sugar (mol. mass = 342) is isotonic with 1 % solution of a substance X. The molecular mass of X is -

A

34.2

B

171.2

C

68.4

D

136.8

Answer

68.4

Explanation

Solution

p1 = p2

5342\frac{5}{342} = 1Mw\frac{1}{Mw}