Question

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.

Answer 1

Use the Clausius-Clapeyron equation. Remember that vapor pressure of tetramethylbutane at its boiling point = 760 mm Hg

Answer 2

kknklnlk