When 9.72 g of an unknown non-electrolyte is dissolved in 50.0 g of cyclohexane, the boiling point increased to 84.93 degrees c from 80.7 degrees c. if the kbp of the solvent is 2.79 k/m, calculate the molar mass of the unknown solute.

Answer : The molar mass of unknown compound is 128.22 g/mole

Explanation :

Mass of unknown compound = 9.72 g

Mass of solvent = 50.0 g

Formula used :

where,

= elevation in boiling point

= temperature of solvent =

= temperature of solution =

i = Van't Hoff factor = 1 (for non-electrolyte)

= boiling point constant for solvent = 2.79 K/m

m = molality

Now put all the given values in this formula, we get:

Therefore, the molar mass of unknown compound is 128.22 g/mole

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