Concord High
School Chemistry
Balancing
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Practice Problem #4:
Hexane (C6H14) is burned in the presence of oxygen gas
Answer to
Practice Problem #4:
1. Identify the type of reaction.
Combustion reaction.
C6H14 + O2 -->
2. Write out the products of the chemical reaction.
Combustion always produces CO2 + H2O.
C6H14 + O2
--> CO2
+ H2O
3. Balance the equation.
C6H14 + O2
--> CO2 + H2O
Balance carbon atoms.
C6H14 + O2
--> 6CO2
+ H2O
Balance
hydrogen atoms.
C6H14 + O2
--> 6CO2 + 7H2O
Balance
oxygen atoms [2 on left and 19 (or 12+7) on the right].
C6H14 + (19/2)O2 --> 6CO2 + 7H2O
Answer to Problem: C6H14 + (19/2)O2
--> 6CO2 + 7H2O