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Depression in freezing point or molality using a given van't Hoff factor

This type of question, asked 2 times: 4 May 2023 S2, 19 Apr 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    4 May 2023 S2

    62
    Calculate ΔTf\Delta T_f of aqueous 0.01 m formic acid if van't Hoff factor is 1.1. [Kf=1.86 K kg mol−1][K_f = 1.86\text{ K kg mol}^{-1}]

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  2. Question 2

    19 Apr 2026 S2

    27
    Calculate the molality of aqueous solution of electrolyte that freezes at −0.93 ∘C-0.93\ ^\circ\mathrm{C} if KfK_f for water and van't Hoff factor respectively are 1.86 K kg mol−11.86\ \mathrm{K\,kg\,mol^{-1}} and 1.251.25. (Freezing point of water =0 ∘C= 0\ ^\circ\mathrm{C} )

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