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)

Determine the balanced chemical equation for this reaction.

C8H18(g)+O2(g)?CO2(g)+H2O(g)


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

B)
After the reaction, how much octane is left?

Explanation / Answer

we balance C first and then H and lastly O

we have 8C left side and hence weget 8 CO2

C8H18 + O2 ---> 8 CO2 + H2O , we have 18 H left side , hence 9 H2O rigth side

C81H18 + O2 ---> 8 CO2 + 9 H2O , we have 25 O left side , hence 25/2 O2 left side

C8H18 + 25/2 O2 ---> 8 CO2 + 9 H2O , now to avoid fraction we multily 2 ,

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

above equation is completely balanced equation

( to answer part A , B we need data of mass etc. In general 18 moles of water is produced per 2 moles of octane. )

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