Question

A solution containing 12.5 gram of non electrolyte substance 175 gram of Water Day boiling point elevation of 1.70 Kelvin calculate the molar mass of the substance​

Answer 1

Answer:

22g

Explanation:

Kb for water is 0.514 Kmol^-1kg

Formula for elevation in boiling point is

$t_b=K_b.\frac{moles of solute}{weight of solvent in kg}$

tb=1.7

moles of solute= mass of solute / molecular mass

= 12.5g/molecular mass of solute

mass of solvent=0.175 kg

putting all this in equation

$1.7=0.514.\frac{12.5}{0.175*molecular mass of solute}$

=21.9 g or 22g