Some nonelectrolyte solute $($molar mass $142\frac{g}{m}ol)$ was dissolved in $150.$

$mL$ of a solvent $($density $0\mathrm{.}879\frac{g}{c}{m}^3).$ The elevated boiling point of the

solution was $355\mathrm{.}4K.$ What mass of solute was dissolved in the solvent? For

the solvent, the enthalpy of vaporization is $33\mathrm{.}90k\frac{J}{m}ol,$ the entropy of

vaporization is $95\mathrm{.}95\frac{J}{K}$mol, and the boiling$-$point elevation constant is $2\mathrm{.}5$

$Kk\frac{g}{m}ol.$