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Molecular weight/Freezing point

When 1.00 g of urea (CO(NH2)2) is dissolved in 200g of solvent A, the freezing point is lowered by 0.250C. When 1.50 g of the nonelectrolyte Y is dissolved in 125 g of the same solvent A, the freezing point is lowered by 0.200C.(a) Find the molecular weight of Y. (b) The freezing point of A is 12C and its molecular weight is 200 g/mol. Find ΔHmfus of A

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