if some cyclohexane evaporated after the solute was added what would be the effect in the calc. molar mass?

Question

A molar mass from freezing-point depression experiment

Answer 1

The solution would be more concentrated than you thought it was. So the depression of freezing point would be greater than it should have been, you will think you had more moles of the solute than you really did have, and your calculated molar mass will be too small.

That's all!