CBSE Class 12-science Answered
2g of a substance dissolved in 40g of water produced a depression of 274.5K in the freezing point of water. Calculate the molecular mass of the substance .The molal depression constant for water is 274.85K per molal
Asked by mukundsharma70 | 05 Aug, 2019, 10:50: PM
Expert Answer
Given:
Mass of solute, w2= 2 gm
Mass of solvent, w1 = 40 gm
Depression in freezing point = 274.85 - 274.5
=0.35 K
Freezing point depression constant Kf = 1.86 K. kg/mol
Molecular mass of solute can be calculated by using formula,
Molecular mass of the substance is 265.71 g/mol
Answered by Varsha | 06 Aug, 2019, 10:36: AM
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