Chapter 13, Problem 31PS

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

What is the boiling point of a solution composed of 15.0 g of CHCl3 and 0.515 g of the nonvolatile solute acenaphthene, C12H10, a component of coal tar?

Interpretation Introduction

Interpretation: The Boiling point of solution to be identified.

Concept introduction:

Boiling point elevation: The boiling point of the solution varies with the solute concentration.

Elevation in boiling point = ΔTbp= Kbp. msolute,where,Kbpismolal boiling point elevation constant,msoluteis molality of solute

Explanation

Given data:

Massâ€‰ofâ€‰acenaptheneâ€‰(solute)Â =â€‰0.515â€‰gMassÂ ofÂ CHCl3Â =Â 15Â gÂ Boilingâ€‰pointâ€‰ofâ€‰solutionâ€‰â€‰=Â ?BoilingÂ pointÂ ofÂ CHCl3Â =Â 61.70oCKbpofâ€‰Water=â€‰+3.63oC/m

No.â€‰ofâ€‰molesâ€‰=â€‰massmolarâ€‰mass

MoleÂ ofÂ soluteÂ =Â 0.515g154.2â€‰g/molâ€‰=â€‰0.0033Â mol

CalculationÂ ofÂ theÂ molalityÂ ofÂ soluteÂ Â inÂ solution(m):_molalityÂ =Â MolesÂ ofÂ soluteÂ (mol)AmountÂ ofÂ solvent(inÂ kg)Â =Â (0.0033Â mol)0.015Â kg=Â 0.22â€‰m

BoilingÂ pointÂ elevation:_Elevationâ€‰Â inÂ boilingÂ pointÂ =Â Î”Tbp=Â Kbp

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