A certain liquid has a normal freezing point of and a freezing point depression constant . Calculate the freezing point of a solution made o

Question

A certain liquid has a normal freezing point of and a freezing point depression constant . Calculate the freezing point of a solution made of of alanine () dissolved in of .

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Nho 2 weeks 2021-07-21T22:36:38+00:00 1 Answers 1 views 0

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    2021-07-21T22:38:07+00:00

    The question is incomplete, the complete question is;

    A certain liquid X has a normal freezing point of 5.40 °C and a freezing point depression constant K=3.05 ?kg mol solution made of 46.1g of alanine (C3H,NO2) dissolved in 750. g of i. Round your answer to 3 significant digits.

    Answer:

    3.3 °C

    Explanation:

    If ∆T= K m I

    Where;

    ∆T = freezing point depression

    K = freezing point constant

    m= morality of solution

    i= Van’t Hoff factor

    Number of moles of solute = 46.1 g/89.09 g/mol = 0.52 moles

    Molality of solution = 0.52 moles /750 ×10-3Kg

    = 0.69 m

    ∆T= 3.05 × 0.69 × 1

    ∆T= 2.10 °C

    Freezing point of solution the solution = freezing point of pure solvent – freezing point depression

    = 5.40°C – 2.10 °C

    = 3.3 °C

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