   # The enthalpy of vaporization for acetone is 32.0 kJ/mol. The normal boiling point for acetone is 56.5°C. What is the vapor pressure of acetone at 23.5°C? ### 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 9, Problem 129CWP
Textbook Problem
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## The enthalpy of vaporization for acetone is 32.0 kJ/mol. The normal boiling point for acetone is 56.5°C. What is the vapor pressure of acetone at 23.5°C?

Interpretation Introduction

Interpretation: At 23.50C the vapor pressure of Acetone has to be calculated.

Concept introduction

Enthalpy of vaporization: The energy required to convert quantity substance from liquid stat to gas state at constant temperature.

Vapor pressure: Vapor pressure is one of the particles which escaped from liquid or solid.

Boiling point: Boiling point is temperature at which the liquid into gas.

### Explanation of Solution

Explanation

Record the given data.

Enthalpy of vaporization for Acetone = 32 kJ/mol

Normal boiling point for Acetone = 56.50C

Enthalpy of vaporization and boiling point for Acetone are recorded as shown.

To calculate vapour pressure for Acetone.

At 56.5°C (329.7 K), the vapour pressure of acetone is 760 torr.

56.50C = 329.7 K =T1

23.50C = 296.7K = T2

Vapour pressure = ln(P2P1)=ΔvapR[1T1-1T2]orln(P1P2)=ΔvapR[1T2-1T1]

Where, R is gas constant which is equal to 8

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