Gasoline Is Primarily a Mixture of Hydrocarbons and Is Sold

question 38

Multiple Choice

Gasoline is primarily a mixture of hydrocarbons and is sold with an octane rating that is based on a comparison with the properties of isooctane (C₈H₁₈) , which has an enthalpy of vaporization of 35.8 kJ/mol and a boiling point of 98.2°C. Determine the vapor pressure of isooctane 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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