Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y, respectively in 1 kg of water. The ratio of depression in freezing points for A and B is found to be 1:4. The rati

Question

Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y, respectively in 1 kg of water. The ratio of depression in freezing points for A and B is found to be 1:4. The ratio of molar masses of X and Y is

Canvas Classes · Accepted Answer

Strategy:
 Depression in freezing point () is inversely proportional to the molar mass () of the solute when common masses of solute and solvent are used ().

Step 1: Express  in terms of molar mass
For solution A and B, mass () and mass of solvent () are the same.

Step 2: Relate the ratios
Given ratio .
Since , then .

Step 3: Express as 1 : X
.

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