Solutions and Colligative Properties 2 Question 35
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35. The freezing point of the solution $M$ is
======= ####35. The freezing point of the solution $M$ is
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed (a) $268.7 \mathrm{~K}$
(b) $268.5 \mathrm{~K}$
(c) $234.2 \mathrm{~K}$
(d) $150.9 \mathrm{~K}$
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Solution:
- In the given solution ’ $M$ ‘, $\mathrm{H}_{2} \mathrm{O}$ is solute.
Therefore, molality of $\mathrm{H}_{2} \mathrm{O}=\frac{0.1}{0.9 \times 46} \times 1000=2.4$
$$ \begin{array}{rlrl} \Rightarrow & -\Delta T_{f} & =K_{f}^{\text {ethanol }} \times 2.4=2 \times 2.4=4.8 \ \Rightarrow & & T_{f} & =155.7-4.8=150.9 \mathrm{~K} \end{array} $$
