Gasoline Is Primarily a Mixture of Hydrocarbons and Is Sold $\degree$

question 100

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 $\degree$ C.Determine the vapor pressure of tetramethylbutane on a very hot day when the temperature is 38.0 $\degree$ C.

• A)80.0 torr
• B)37.1 torr
• C)67.8 torr
• D)47.9 torr
• E)89.3 torr

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Definitions:

Oblongata

Refers to the medulla oblongata, the lower portion of the brainstem controlling autonomic functions.

Arachnoid

A thin, delicate membrane that envelops the brain and spinal cord, part of the meninges.

Papilledema

Swelling of the optic disk due to increased intracranial pressure, often observable through an eye examination.

Pallidotomy

A neurosurgical procedure that involves destroying a tiny part of the brain's globus pallidus to improve symptoms of Parkinson's disease.