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Alycia Zemlak

Feb 20, 2025

Determine the freezing point of a solution that contains 78.8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722

Determine the freezing point of a solution that contains 78.8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0.877 g/mL). Pure benzene has a melting point of 5.50°C and a freezing point depression constant of 4.90°C/m
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0.74°CExplanation:The freezing point depression is a colligative property that can be calculated using the following expression.ΔTf = Kf . b where,ΔTf: depression in the melting pointKf: freezing point depression constantb: molalityThe mass of the solvent (benzene) is: The moles of solute (naphtalene) are:The molality of naphtalene is:ΔTf = Kf . bΔTf = (4.90°C/m) . 0.972m = 4.76°CThe melting point of the solution is:5.50°C - 4.76°C = 0.74°C... Show More
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