A sample of gasoline contains 81% iso-octane and 19% nheptane. Its octane number will be……..

Question

Quizplus · Accepted Answer

The octane number of a fuel is a measure of its resistance to knocking or pinging during combustion, with higher numbers indicating greater resistance. Iso-octane, with a chemical structure that resists knocking, has an octane rating of 100, serving as the standard for high octane rating, while n-heptane, which knocks easily, has an octane rating of 0. The octane number of a mixture can be approximated by the volume percentage of iso-octane in the mixture if the other component is n-heptane. Therefore, a mixture of 81% iso-octane and 19% n-heptane would have an octane number approximately equal to the percentage of iso-octane, which is 81.

A Sample of Gasoline Contains 81% Iso-Octane and 19% Nheptane