The octane rating of gasoline is a relationship of the burning efficiency of the

Question

The octane rating of gasoline is a relationship of the burning efficiency of the given gasoline mixture to the burning efficiency of octane (C8H18). (Figure 1) Like most hydrocarbons, octane reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is C8H18(g)+O2(g)CO2(g)+H2O(g)

2C8H18(g)+25O2(g)16CO2(g)+18H2O(g)

1) How many moles of water are produced in this reaction?

2) After the reaction, how much octane is left? Express your answer with the appropriate units.

Explanation / Answer

1) The balanced reaction for combustion of octane is given as

2C8H18 + 25O2 = 16CO2 + 18H2O

So you may see 2moles of octane require 25 moles of oxygen to produce 16 moles of carbon dioxide and 18 moles of water.

So 18 moles of water are produced in this reaction.

2.) No octane is left after this reaction , as it is utilised completely.

So 0 moles of octane are left.

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