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)

One molal aqueous solution contains $1$ mole of the solute in $1000g$ of $H_{2}Oi.e.$, $1000/18$
= $55.55$ moles of water
$\therefore$ mole fraction of the solute = $\frac{1}{1+55.55}$
= $0.018$.