Question

Mole fraction of the solute in $1$ molal aqueous solution is

• A. 0.027
• B. 0.036
• C. 0.018
• D. 0.009

Answer 1

Answer: (C)

0.018

Answer 2

One molal aqueous solution contains $1$ mole of the solute in $1000\, g$ of $H_2O \, i.e.$, $1000/18$ = $55.55$ moles of water $\therefore$ mole fraction of the solute = $\frac{1}{1 + 55.55}$ = $0.018$.