When 0.49 g of a molecular compound was dissolved in 20.00 g of cyclohexane, the freezing point of the solution was lowered by 3.9 0C. Determine the molecular mass of this compound.

The molecular mass of this compound is 131 g/mol

Explanation:

Depression in freezing point:

where,

= depression in freezing point  =

= freezing point constant  =

m = molality

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

= mass of solute = 0.49 g

= mass of solvent (cyclohexane) = 20.00 g

= molar mass of solute = ?

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

Therefore, the molar mass of solute is 131 g/mol

yes definetly because you are using energy