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14 December, 12:14

What is the molar mass of a covalent compound if 0.486 g of it is dissolved in 25.0 ml of water and produces a freezing temperature of - 0.40 °c?

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  1. 14 December, 15:32
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    Answer is: the molar mass of a covalent compound is 90.4 g/mol.

    m (compound) = 0.486 g.

    m (water) = 25 mL · 1 g/mL = 25 g : 1000 g/kg = 0.025 kg.

    ΔT = 0°C - (-0.40°C) = 0.40°C.

    Kf (H₂O) = 1.86°C/m.

    M (compound) = Kf · m (compound) / m (water) · ΔT.

    M (compound) = 1.86°C/m · 0.486 g / (0.025 kg · 0.4°C).

    M (compound) = 90.4 g/mol.
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