Chapter 13, Problem 30PS

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 urea, (NH2)2CO, in 0.500 kg of water?

Interpretation Introduction

Interpretation: The Boiling point of solution (Water) 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€‰â€‰ureaâ€‰(solute)Â =â€‰15â€‰gMassÂ ofÂ WaterÂ =Â 0.500Â kgÂ Boilingâ€‰pointâ€‰ofâ€‰solutionâ€‰â€‰=Â ?

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

MoleÂ ofÂ soluteÂ =Â 15g60.06â€‰g/molâ€‰=â€‰0.249Â mol

Known data:

BoilingÂ pointÂ ofÂ waterÂ =Â 100oCKbpofâ€‰Water=â€‰+0.5121oC/m

CalculationÂ ofÂ theÂ molalityÂ ofÂ soluteÂ Â inÂ solution(m):_molalityÂ =Â MolesÂ ofÂ soluteÂ (mol)AmountÂ ofÂ solvent(inÂ kg)Â =Â (0.249Â mol)0.500Â kg=Â 0.498â€‰m

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

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