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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

A solution is prepared by mixing 1.000 mole of methanol (CH3OH) and 3.18 moles of propanol (CH3CH2CH2OH). What is the composition of the vapor (in mole fractions) at 40°C? At 40°C, the vapor pressure of pure methanol is 303 torr, and the vapor pressure of pure propanol is 44.6 torr.

Interpretation Introduction

Interpretation: The composition of the vapor (in mole fractions) at 40°C for the given propanol methanol mixture should be calculated.

Concept introduction:

  • Raoult's law:

    The mole fraction of a solute is related to the vapor pressure of the solution thus,

                                 Psolution=P°solventXsolvent......(1)Pisvapor pressureof the solutionsolventpressureof the solventXsolvent mole fraction ofsolvent

Explanation

Record the given data,

                         Mole of methanol =1.00 mole

                         Mole of propanol =3.18 mole

              Vapor pressure of pure methanol =303torr

              Vapor pressure of pure propanol =44.6 torr .

To calculate the mole fraction of methanol in liquid phase.

                 Totalmol=Methanolmol+Propanolmol=3.8+1=4.8mol                 χLmethanol=1.00mol4.18totalmol=0

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