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Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
Publisher: Cengage Learning
ISBN: 9781305079373

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Section
BuyFindarrow_forward

Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
Publisher: Cengage Learning
ISBN: 9781305079373
Chapter 9, Problem 7QAP
Textbook Problem
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Chloroform, CHCl3, was once used as an anesthetic. In spy movies it is the liquid put in handkerchiefs to render victims unconscious. Its vapor pressure is 197 mm Hg at 23°C and 448 mm Hg at 45°C. Estimate its

(a) heat of vaporization.

(b) normal boiling point.

(a)

Interpretation Introduction

Interpretation:

The heat of vaporization of chloroform is to be calculated using the given data.

Concept Introduction :

Clausius-Clapeyron Equation is an expression that relates the vapor pressure of a liquid at two different temperatures with the enthalpy of vaporization of the liquid. The expression is given as

  lnP2P1=ΔHvapR[1T11T2]

P1 = vapor pressure at temperature T1

P2 = vapor pressure at temperature T2

  ΔHvap = Enthalpy of vaporization of the liquid

R = Ideal gas constant = 8.314 J/Kmol

Explanation of Solution

Given:

The vapor pressure of dichloromethane at two different temperatures:

P1 = 197 mm Hg

T1 = 23 0C = (23+273) K = 296 K

P2 = 448 mm Hg

T2 = 450C = (45+273) K = 318 K

The heat of vaporization of dichloromethane can be calculated using Clausius-Clapeyron Equation:

  ln448197=ΔH vap8.314 J/Kmol[12961318]K10

(b)

Interpretation Introduction

Interpretation:

The normal boiling point of chloroform under given conditions is to be calculated.

Concept Introduction :

Clausius-Clapeyron Equation is an expression that relates the vapor pressure of a liquid at two different temperatures with the enthalpy of vaporization of the liquid. The expression is given as

  lnP2P1=ΔHvapR[1T11T2]

P1 = vapor pressure at temperature T1

P2 = vapor pressure at temperature T2

  ΔHvap = Enthalpy of vaporization of the liquid

R = Ideal gas constant = 8.314 J/Kmol

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Chapter 9 Solutions

Chemistry: Principles and Reactions
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