Which solution will have the lowest freezing point?

Question

0.25 molal aqueous solution of sucrose
0.5 molal aqueous solution of glucose
solution of 180 g of glucose (MW = 180.2 g/mol) in one kg of water.
pure water

Answer 1

delta T = Kf*m will tell you. Since Kf is a constant, the largest m will give the largest delta T.