Chapter 13, Problem 29PS

### 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 containing 0.200 mol of a nonvolatile solute in 125 g of benzene (C6H6)?

Interpretation Introduction

Interpretation: The Boiling point of solution (Benzene) has 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:

MoleÂ ofÂ soluteÂ =Â 0.200Â mol;MassÂ ofÂ BenzeneÂ =â€‰125Â gÂ =Â 0.125Â kgÂ Boilingâ€‰pointâ€‰ofâ€‰solutionâ€‰â€‰=Â ?

Known data:

BoilingÂ pointÂ ofÂ BenzeneÂ =Â 80.10oCKbpofâ€‰benzene=â€‰+2.53oC/m

Molality of a solute is defined as the amount of solute dissolves in kilogram of solvent.

Â Â Molalityâ€‰=â€‰molesâ€‰ofâ€‰soluteMassâ€‰ofâ€‰solventâ€‰inâ€‰kg

molalityÂ =Â MolesÂ ofÂ soluteÂ (mol)AmountÂ ofÂ solvent(inÂ kg)Â =Â (0.200Â mol)0.125Â kg=Â 1.6â€‰m

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

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