Mole fraction of the solute in a 1.00 molal aqueous solution is

Mole fraction of the solute in a 1.00 molal aqueous solution is
  1. 0.0177
  2. 0.0344
  3. 1.7700
  4. 0.1770

Solution

1.00 molal aqueous solution $=1.0$ mole in $100 \mathrm{~g}$ water $n_{\text {solute }}=1 ; W_{\text {solvent }}=1000 \mathrm{~g}$. $\begin{aligned} & n_{\text {solvent }}=\frac{1000}{18}=55.56 \\ & X_{\text {solute }}=\frac{1}{1+55.56}=0.0177 \end{aligned}$

Asked in: NEET 2011 (Screening)

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