Solutions and Colligative Properties 2 Question 37
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37. Water is added to the solution $M$ such that the mole fraction of water in the solution becomes 0.9 . The boiling point of this solution is
======= ####37. Water is added to the solution $M$ such that the mole fraction of water in the solution becomes 0.9 . The boiling point of this solution is
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed (a) $380.4 \mathrm{~K}$
(b) $376.2 \mathrm{~K}$
(c) $375.5 \mathrm{~K}$
(d) $354.7 \mathrm{~K}$
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Solution:
- Now ethanol is solute.
Molality of solute $=\frac{0.1}{0.9 \times 18} \times 1000=6.17$
$$ \begin{array}{rlrl} \Rightarrow & & \Delta T_{b} & =6.17 \times 0.52=3.20 \ \Rightarrow & & T_{b} & =373+3.2 \ & & =376.2 \mathrm{~K} \end{array} $$
