First slide

Theory of dilute solutions

Question

If a 6.84% (weight/volume) solution of cane sugar (molecular weight - 342) is isotonic with 1.52% (weight/ volume) solution of thiocarbamide, then the molecular weight of thiocarbamide is

Moderate

A

152
B

760
C

60
D

180

Solution

For two non-electrolytic solutions, if isotonic, C₁=C₂
$∴ \frac{6.84 \times 100}{342 \times 100} = \frac{1.52 \times 1000}{M w_{2} \times 100} \Rightarrow M w_{2} = 760$

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