What is the freezing point of a solution made from 785.5 grams of benzene to which 60.9 grams of the nonelectrolyte cycloheptene (C7H12) has been added? (Report freezing temperature to the hundredths place - two decimal places)

Answered: What is the freezing point of a…

Chemistry by OpenStax (2015-05-04)

1st Edition

ISBN:9781938168390

Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Chapter11: Solutions And Colloids

Section: Chapter Questions

Problem 62E: What is the freezing point of a solution of dibromobenzene, C6H4Br2, in 0.250 kg of benzene, if the...

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What is the freezing point of a solution made from 785.5 grams of benzene to which 60.9 grams of the nonelectrolyte cycloheptene (C₇H₁₂) has been added?

(Report freezing temperature to the hundredths place - two decimal places)

Expert Solution

Step 1

Given,

Mass of non electrolyte cyclohetene solute = 60.9 g

Mass of benzene solvent = 785.5 g = 0.7855 Kg

Freezing point of a solution (T_f(solution)) = ?

Note:

Molar mass of cyclohetene (C₇H₁₂) = (7×12.01 +12×1.01) g/mol = 96.19 g/mol

Freezing point of pure benzene (T_f°_(benzene)) = 5.5 °C

Freezing point depression constant (K_f) for benzene = 5.12 °C/m

van't Hoff factor (i) for cyclohetene (C₇H₁₂) = 1 (nonelectrolyte)

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