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ChemistryChemistry: An Atoms First Approach2nd Edition
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Carbon tetrachloride, CCI 4 , has a vapor pressure of 213 torr at 40.°C and 836 torr at 80.°C. What is the normal boiling point ofCCl 4 ?

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Chemistry: An Atoms First Approach

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

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Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 9, Problem 93E
Textbook Problem
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Carbon tetrachloride, CCI4, has a vapor pressure of 213 torr at 40.°C and 836 torr at 80.°C. What is the normal boiling point ofCCl4?

Interpretation Introduction

Interpretation: The normal boiling point of Carbon tetrachloride should be calculated.

Concept introduction:

Equilibrium vapor pressure:

  • The pressure throw by vapor of the substance is equilibrium liquid or solid state of same substance is called the equilibrium vapor pressure, thus,

  •                     ln(Pvap 1Pvap 2)= ΔΗvapR(1T2-1T1) ......(1)                       Pvap 1 and Pvap 2 are vapor pressures                       T1 and T2 are temperatures                       ΔΗvap is enthalpy of vaporization                       R is  constant

  • The liquids is boiled when the vapor pressure of liquid is equal to atmospheric pressure.

Explanation of Solution

Explanation

Record the given data;

  • The vapor pressure of CCl4 at 40°C is 213 atm.
  • The vapor pressure of CCl4 at 80°C is 836 atm.
  • The vapor pressure of given temperatures are recorded as shown above.

To calculate the enthalpy of vaporization of CCl4.

           Constant R = 8.3145 J/K. mol

                                  ln(836 torr213 torr)= ΔΗ8.3145 J/K. mol(1313 k-1353 K)   ln(836 torr213 torr)(1313 k-1353 K)= ΔΗ8.3145 J/K. mol                               ΔΗ=ln(836 torr213 torr)(1313 k-1353 K)×8.3145 J/K. mol                                     = 3

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