Gasoline is a mixture composed primarily of hydrocarbons such as isooctane, which is also known as 2,2,4-trimethylpentane. Gasoline is assigned a number called an octane rating. Gasoline with an octane rating of 87 performs the same as a mixture that consists of 87% isooctane and 13% heptane. An alternative fuel, E-85, can be used in some automobiles. This fuel is a mixture of 85 % ethanol and 15% gasoline. 67 State the octane rating of a gasoline sample that performs the same as a mixture consisting of 92% isooctane and 8% heptane. [1] HIGHLIGHT TO SEE THE ANSWER | the percent isooctane is the octane rating ANSWER=92 |
68 In the space in your answer booklet, draw a structural formula for a molecule of 2,2,4-trimethylpentane. [1] Answer to question 68 69 Identify the functional group in a molecule of ethanol in the alternative fuel E-85. [1] HIGHLIGHT TO SEE THE ANSWER Use Table R - OH; alcohol; hydroxylNote: Do not allow credit for hydroxide or OH- |
|