Q.

Toluene, C7H8, is added to gasoline to increase its octane rating. What is the volume ratio of air to toluene vapor to burn completely to form CO2 and H2O ? (Assume air is 20%O2 by volume.)

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a

281

b

111

c

451

d

91

answer is D.

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Detailed Solution

In the following reaction,

C7H8+9O27CO2+4H2O

1 mole toluene need 9 moles O2 9n one mole air, only 20%(0.2 mole) is O2.

It will be present in 45 moles of air,

airc7H8=451

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