Question

The elevation in boiling point, when 13.44 g of freshly prepared CuCI$_2$ are added to one kilogram of water, is . [Some useful data, K$_b = 0.52 K kg mol^{-1}$, molecular weight of CuCl$_2$ =134.4 g]

• A. 0.05
• B. 0.1
• C. 0.16
• D. 0.21

Answer 1

Answer: (C)

0.16

Answer 2

Molality $=\frac{13.44}{134.1}=0.1$ \hspace30mm i=3 $\Rightarrow \, \, \, \, \, \, \, \Delta T_b =iK_b .m =3 \times 0.52 \times 0.1 =0.156$