1. Tardigrade
  2. Question
  3. Chemistry
  4. When 3.00 g of a substance ' X ' is dissolved in 100 g of CCl 4, it raises the boiling point by 0.60 K. The molar mass of the substance ' X ' is g mol -1. (Nearest integer). [ Given K b for CCl 4 is 5.0 K kg mol -1 ]

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. When $3.00\, g$ of a substance ' $X$ ' is dissolved in $100\, g$ of $CCl _{4}$, it raises the boiling point by $0.60\, K$. The molar mass of the substance ' $X$ ' is_______ $g\, mol ^{-1}$. (Nearest integer).
[ Given $K _{b}$ for $CCl _{4}$ is $5.0\, K\,kg\,mol ^{-1}$ ]

JEE MainJEE Main 2021Solutions

Solution:

$\Delta T_{b}=K_{b} \times$ molality
$0.60=5 \times\left(\frac{3 / M}{100 / 100}\right)$
$M=250$