J.R. S. answered 07/20/19
Ph.D. University Professor with 10+ years Tutoring Experience
∆T = imK
∆T = change in freezing point or boiling point = ?
i = van't Hoff factor = 1 for a non electrolyte
m = molality = moles of solute/kg of solvent. There isn't enough information provided to find this value
K = freezing or boiling point constant for benzene. You can look up these values in any chemistry text.
So, there is not enough information provided in the original question to answer this.