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Depression in freezing point from mass and molar mass of solute and mass of solvent

The same question, asked 2 times: 10 May 2024 S1*, 14 May 2024 S1. Every wording below, oldest first.

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  1. Question 1

    10 May 2024 S1

    53
    3.2 g solute (molar mass 128 g/mol) in 80 g solvent, Kf=4.8K_f=4.8 K·kg/mol. Depression in freezing point is

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  2. Question 2

    14 May 2024 S1

    67
    Calculate the depression in freezing point of solution when 4 g nonvolatile solute of molar mass 126 g mol−1126\,\text{g mol}^{-1} is dissolved in 80 ml water. [Cryoscopic constant of water =1.86 K kg mol−1=1.86\,\text{K kg mol}^{-1}]

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