When 300g of a substance 'X' is dissolved in 100g of ${\mathrm{CCl}}_4$, it raises the boiling point by 0.60 K. the molar mass of the substance 'X' is ______ ${gmol}^{-1}$

$\Delta T_b=K_{b}m$
m is molality
$\Delta T_{\mathrm{b}}=0.6$ is elevation in boiling point
${\mathrm{K}}_{\mathrm{b}}=5$ is ebullioscopic constant
$0.60=\frac{5.0\times 3.00\times 1000}{M\times 100}$
M=250

Hence, Molecular weight of the substance =250