Q61 / 200 · NEET 2011 (Screening) · Chemistry

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

  • Correct answer
    A
    0.0177
  • B
    0.0344
  • C
    1.7700
  • D
    0.1770

Solution

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

Hence, the correct answer is option: 'A'.

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