Calculate the freezing point of a solution of 1.95 g of naphthalene (C10H8) in 15.50 g of benzene.The freezing point of pure benzene is 5.5°C.Kf = 5.12°C kg/mol

Answered: Calculate the freezing point of a…

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter13: Solutions And Their Behavior

Section13.4: Colligative Properties

Problem 13.10CYU: Calculate the freezing point of 525 g of water that contains 25.0 g of NaCl. Assume i, the vant Hoff...

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Calculate the freezing point of a solution of 1.95 g of naphthalene (C₁₀H₈) in 15.50 g of benzene.
The freezing point of pure benzene is 5.5°C.
K_f = 5.12°C kg/mol

Expert Solution

Step 1

This is a depression of freezing point or lowering of freezing point problem. This lowering of the freezing point depends on the amount or number of solute present in the solution.

The lowering of freezing point(ΔT_f) is formulated as

ΔT_f = K_f * m

Where K_fis freezing point depression constant

m is the molality of the solution

ΔT_f= freezing point of pure substance - freezing point of solution

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