Ch.11 - Liquids, Solids & Intermolecular ForcesWorksheetSee all chapters
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Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: The vapor pressure of carbon tetrachloride is measured as a function of temperature and the results are tabulated and shown in the table below. Determine the heat of vaporization of carbon tetrachlori

Solution: The vapor pressure of carbon tetrachloride is measured as a function of temperature and the results are tabulated and shown in the table below. Determine the heat of vaporization of carbon tetrachlori

Problem

The vapor pressure of carbon tetrachloride is measured as a function of temperature and the results are tabulated and shown in the table below. Determine the heat of vaporization of carbon tetrachloride from the results.


Temperature  (K)Pressure  (torr)
25511.3
26521.0
27536.8
28561.5
29599.0
300123.8



Solution
  • Heat of vaporization can be solved using the Clasius-Clapeyron equation where:

  • Where P is pressure (any unit will do as long as P1 and P2 have the same unit) and T is temperature in K. ΔHvap is heat of vaporization in J/mol while R is gas constant (8.314 J/mol K)

  • Plugging in the values of P and T from the table provided (I'll be using 255 K and 265 K but any will do):

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