Solutions and Colligative Properties - Result Question 65

####36. The vapour pressure of the solution $M$ is

(a) $39.3 mm Hg$

(b) $36.0 mm Hg$

(c) $29.5 mm Hg$

(d) $28.8 mm Hg$

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Solution:

  1. Vapour pressure $=p\left(H _2 O\right)+p($ ethanol $)$

$$ \begin{aligned} & =32.8 \times 0.1+40 \times 0.9 \ & =3.28+36 \ & =39.28 mm \end{aligned} $$



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