CH4 + O2—> Co2+HO2–>Co2+H2O

CH4 + 2O2 —> CO2 + 2H2O

Explanation:

CH4 + O2 —> CO2 + H2O

The above equation can be balance as follow:

Therefore are 4 atoms of H on the left side of the equation and 2 atoms on the right side. It can be balance by putting 2 in front of H2O as shown below:

CH4 + O2 —> CO2 + 2H2O

Now, there are a total of 4 atoms of O on the right side and 2 atoms on the left. It can be balance by putting 2 in front of O2 as shown below:

CH4 + 2O2 —> CO2 + 2H2O

Now, we can see that the equation is balanced as there are equal numbers of atoms of the different elements present on both sides of the equation.

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