Solutions and Colligative Properties 2 Question 36
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36. The vapour pressure of the solution $M$ is
======= ####36. The vapour pressure of the solution $M$ is
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed (a) $39.3 \mathrm{~mm} \mathrm{Hg}$
(b) $36.0 \mathrm{~mm} \mathrm{Hg}$
(c) $29.5 \mathrm{~mm} \mathrm{Hg}$
(d) $28.8 \mathrm{~mm} \mathrm{Hg}$
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Solution:
- Vapour pressure $=p\left(\mathrm{H}_{2} \mathrm{O}\right)+p($ ethanol $)$
$$ \begin{aligned} & =32.8 \times 0.1+40 \times 0.9 \ & =3.28+36 \ & =39.28 \mathrm{~mm} \end{aligned} $$
