   Chapter 13, Problem 29PS

Chapter
Section
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:

Mole of solute = 0.200 mol;Mass of Benzene =125 g = 0.125 kg Boilingpointofsolution= ?

Known data:

Boiling point of Benzene = 80.10oCKbpofbenzene=+2.53oC/m

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

Molality=molesofsoluteMassofsolventinkg

molality = Moles of solute (mol)Amount of solvent(in kg) = (0.200 mol)0.125 kg= 1.6m

Boiling point elevation:_Elevation in boiling point = ΔTbp= Kbp

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