Question

A $5\%$ solution of sucrose is isotonic with $3\%$ solution of a solute find molecular weight of that solute?

• A. $54g$
• B. $108g$
• C. $216g$
• D. $65g$

Answer 1

The correct option is B $108g$

$5\%$ Glucose solution is isotonic with $3\%$ of unknown solute

$\therefore$ conc. of glucose $=$ conc. of solute

$\frac{5}{180}=\frac{3}{M}$

$M=\frac{3\times 180}{5}=108g$

Therefore, the option is B.