The freezing point of benzene is 5.5°C. What is the freezing point of a solution of 2.60 g of naphthalene (C10H8) in 675 g of benzene (Kf of benzene = 4.90°C/m)?

The freezing point of solution is 5.35°C

Explanation:

The equation used to calculate depression in freezing point follows:

To calculate the depression in freezing point, we use the equation:

Or,

where,

Freezing point of pure solution = 5.5°C

i = Vant hoff factor = 1 (For non-electrolytes)

= molal freezing point elevation constant = 4.90°C/m

= Given mass of solute (naphthalene) = 2.60 g

= Molar mass of solute (naphthalene) = 128.2 g/mol

= Mass of solvent (benzene) = 675 g

Putting values in above equation, we get:

Hence, the freezing point of solution is 5.35°C

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