Question

$Y g$ of non-volatile organic substance of molecular mass $M$ is dissolved in $250\, g$ benzene. Molal elevation constant of benzene is $K_{b}$. Elevation in its boiling point.is given by

• A. $\frac{M}{K_{b} Y}$
• B. $\frac{4 K_{b} Y}{M}$
• C. $\frac{K_{b} Y}{4 M}$
• D. $\frac{K_{b} Y}{M}$

Answer 1

Answer: (B)

$\Delta T_{b}=\frac{1000 \times K_{b} \times Y}{250 \times M}=\frac{4 K_{b} Y}{M}$