The combustion reaction is:
C2H6 + O2 -> CO2 + H2O
Balance C:
C2H6 + O2 -> 2 CO2 + H2O
Balance H:
C2H6 + O2 -> 2 CO2 + 3 H2O
Balance O:
2 C2H6 + 7 O2 -> 4 CO2 + 6 H2O
The equation is now balanced.
Answer:
2 C2H6 + 7 O2 -> 4 CO2 + 6 H2O
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