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Molality of a solution from its depression in freezing point and Kf

The same question, asked 4 times: 2 May 2023 S1*, 16 May 2023 S2*, 20 Apr 2025 S2*, 26 Apr 2025 S1. Every wording below, oldest first.

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  1. Question 1

    2 May 2023 S1

    82
    Calculate the molality of solution of non-volatile solute having depression in freezing point 0.93 K and cryoscopic constant of solvent 1.861.86 K kg mol−1^{-1}.

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  2. Question 2

    16 May 2023 S2

    93
    Calculate the molality of solution if its depression in freezing point is 0.18 K. Kf=1.6K_f = 1.6 K kg mol−1^{-1}

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  3. Question 3

    20 Apr 2025 S2

    83
    Calculate the molality of nonvolatile solution if solution freezes at −0.95∘C-0.95^{\circ}C [Kf\left\lbrack K_{f} \right. for water, =1.86 K mol−1= 1.86\text{ }K{\text{ }mol}^{- 1}, freezing point of water =0∘C=0^{\circ}C ]

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  4. Question 4

    26 Apr 2025 S1

    97
    Calculate the molality of the solution of nonvolatile solute if it freezes at −0.36∘C-0.36^{\circ}C. [KfK_{f} for solvent =1.86 K kg mol−1= 1.86\text{ }K\text{ }kg{\text{ }mol}^{- 1}]

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