Solutions and Colligative Properties 2 Question 19
19. The elevation in boiling point, when $13.44 \mathrm{~g}$ of freshly prepared $\mathrm{CuCl}{2}$ are added to one kilogram of water, is. [Some useful data, $K{b}=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$, molecular weight of $\left.\mathrm{CuCl}_{2}=134.4 \mathrm{~g}\right]$.
(2005, 1M)
(a) 0.05
(b) 0.1
(c) 0.16
(d) 0.21
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Solution:
- Molality $=\frac{13.44}{134.1}=0.1$
$$ \begin{aligned} i & =3 \ \Rightarrow \quad \Delta T_{b}=i K_{b} \cdot m & =3 \times 0.52 \times 0.1=0.156 \end{aligned} $$
