Question

If osmotic pressure of 5% (w/v) solution of sucrose is same as 3% (w/v) solution of 'X' find molecular mass of X.

• A. 570
• B. 205.2
• C. 342
• D. none

Answer 1

Answer: (B)

205.2

$i_1{c}_1=i_2{c}_2$
$\frac{5\times 1000}{342\times 100}=\frac{3}{M}\times \frac{1000}{100}$
$M=\frac{3}{5}\times 342=205.2$