   # What is the composition of a methanol (CH 3 OH)-propanol (CH 3 CH 2 CH 2 OH) solution that has a vapor pressure of 174 torr at 40°C? At 40°C, the vapor pressures of pure methanol and pure propanol are 303 and 44.6 torr, respectively. Assume the solution is ideal. ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 10, Problem 59E
Textbook Problem
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## What is the composition of a methanol (CH3OH)-propanol (CH3CH2CH2OH) solution that has a vapor pressure of 174 torr at 40°C? At 40°C, the vapor pressures of pure methanol and pure propanol are 303 and 44.6 torr, respectively. Assume the solution is ideal.

Interpretation Introduction

Interpretation: The composition of the mixture to be calculated.

Concept introduction

Mole fraction is the concentration of the solution or mixture. It can be written as moles of one component divided by total moles of the solution or mixture.

Mole fraction = moles of one componenttotal moles of the solution

### Explanation of Solution

Record the given data

Total pressure of the solution = 174 torr.

Temperature = 400C

Vapor pressure of pure CH3OH = 303torr.

Vapor pressure of pure CH3CH2CH2OH = 44.6torr.

To calculate mole fraction of Methanol and Propanol.

Ptotal= Pmeth+ Pprop

174 torr = χLMeth(303torr) + χLProp(44

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