Solutions and Colligative Properties - Result Question 66
####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
(a) $380.4 K$
(b) $376.2 K$
(c) $375.5 K$
(d) $354.7 K$
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Solution:
- Now ethanol is solute.
Molality of solute $=\frac{0.1}{0.9 \times 18} \times 1000=6.17$
$$ \begin{array}{rlrl} \Rightarrow & & \Delta T _b & =6.17 \times 0.52=3.20 \ \Rightarrow & & T _b & =373+3.2 \ & & =376.2 K \end{array} $$
