Gasoline is a complex mixture of hydrocarbons, including different isomers of octane. Gasoline is sold with a variety of octane ratings that are based on the comparison of the gasoline with the combustion properties of isooctane, a structural isomer of C8H18. The structure of isooctane and another isomer of C8H18 are shown in the figure below, along with their normal boiling points and heats of vaporization. Determine the vapor pressure of each isomer on a very hot summer day, 38.0 °C.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Gasoline is a complex mixture of hydrocarbons, including different isomers of octane. Gasoline is sold
with a variety of octane ratings that are based on the comparison of the gasoline with the combustion
properties of isooctane, a structural isomer of C8H18. The structure of isooctane and another isomer of
C8H18 are shown in the figure below, along with their normal boiling points and heats of vaporization.
Determine the vapor pressure of each isomer on a very hot summer day, 38.0 °C.
Price per gallon
All taxes included
MINIMUM OCTANE RATING
(R+M)/2 METHOD
87
PRESS
xx
$ 2.05
Isooctane
bp=98.2°C
AHvap = 35.8 kJ/mol
Price per gallon
All taxes included
MINIMUM OCTANE RATING
(R+M)/2 METHOD
Image credit: Stephen VanHorn/Shutterstock
89
PRESS
S
Price per gallon
All taxes included
MINIMUM OCTANE RATING
(R+M)/2 METHOD
93
PRESS
Tetramethylbutane
bp = 106.5°C
AHvap= 43.3 kJ/mol
Transcribed Image Text:Gasoline is a complex mixture of hydrocarbons, including different isomers of octane. Gasoline is sold with a variety of octane ratings that are based on the comparison of the gasoline with the combustion properties of isooctane, a structural isomer of C8H18. The structure of isooctane and another isomer of C8H18 are shown in the figure below, along with their normal boiling points and heats of vaporization. Determine the vapor pressure of each isomer on a very hot summer day, 38.0 °C. Price per gallon All taxes included MINIMUM OCTANE RATING (R+M)/2 METHOD 87 PRESS xx $ 2.05 Isooctane bp=98.2°C AHvap = 35.8 kJ/mol Price per gallon All taxes included MINIMUM OCTANE RATING (R+M)/2 METHOD Image credit: Stephen VanHorn/Shutterstock 89 PRESS S Price per gallon All taxes included MINIMUM OCTANE RATING (R+M)/2 METHOD 93 PRESS Tetramethylbutane bp = 106.5°C AHvap= 43.3 kJ/mol
1 atm = 760 torr
For isooctane:
Partz
For tetramethylbutane:
torr
torr
Transcribed Image Text:1 atm = 760 torr For isooctane: Partz For tetramethylbutane: torr torr
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