Octane is a liquid component of gasoline.Given the following vapor pressures of octane at various temperatures, estimate the boiling point of octane in Leadville, Colorado, where the atmospheric pressure is 496 mmHg. 400 mmHg @ 104°C, 500 mmHg @ 111°C, 600 mmHg @ 117°C, 700 mmHg @ 122°C, 760 mmHg @ 125°C
A)125°C
B)120°C
C)115°C
D)110°C
E)105°C

Question

Quizplus · Accepted Answer

The boiling point is the temperature at which the vapor pressure equals the atmospheric pressure. Since the atmospheric pressure in Leadville is 496 mmHg, we look for the temperature where the vapor pressure is closest to 496 mmHg. The vapor pressure of octane is 500 mmHg at 111°C, so the boiling point is approximately 110°C.

Octane Is a Liquid Component of Gasoline