Gasoline Is Primarily a Mixture of Hydrocarbons and Is Sold

question 13

Multiple Choice

Gasoline is primarily a mixture of hydrocarbons and is sold with an octane rating that is based on a comparison with the combustion properties of isooctane. Gasoline usually contains an isomer of isooctane called tetramethylbutane (C₈H₁₈) , which has an enthalpy of vaporization of 43.3 kJ/mol and a boiling point of 106.5C. Determine the vapor pressure of tetramethylbutane on a very hot summer day when the temperature is 38C.

• A)80.0 torr
• B)36.7 torr
• C)67.8 torr
• D)47.9 torr
• E)89.3 torr

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