Question

$2g$ of a non-volatile non-electrolyte solute is dissolved in $200g$ of two different solvents $A$ and $B$ whose ebullioscopic constants are in the ratio of $1:8$. The elevation in boiling points of $A$ and $B$ are in the ratio $\frac{x}{y}(x:y)$. The value of $y$ is _________(Nearest integer)

Answer 1

Answer: 8

Given : $\frac{{\left(K_b\right)}_A}{{\left(K_b\right)}_B}=\frac{1}{8}$
$\therefore \frac{{\left(\Delta T_B\right)}_A}{{\left(\Delta T_B\right)}_B}=\frac{{\left(K_b\right)}_A\cdot m}{{\left(K_b\right)}_B\cdot m}=\frac{1}{8}=\frac{x}{y}$
$\frac{x}{y}=\frac{1}{8}$
$\therefore y=8$ (nearest integer)