   # 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 ? ### 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 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(Pvap1Pvap2)=ΔΗvapR(1T2-1T1)......(1)Pvap1andPvap2arevapor pressuresT1andT2aretemperaturesΔΗvapisenthalpy of vaporizationR 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 213atm.
• The vapor pressure of CCl4 at 80°C is 836atm.
• The vapor pressure of given temperatures are recorded as shown above.

To calculate the enthalpy of vaporization of CCl4.

Constant R =8.3145J/K.mol

ln(836torr213torr)=ΔΗ8.3145J/K.mol(1313k-1353K)ln(836torr213torr)(1313k-1353K)=ΔΗ8.3145J/K.molΔΗ=ln(836torr213torr)(1313k-1353K)×8.3145J/K.mol=3

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