Answer :

[tex]CH4+O2=CO2+4H20 [/tex]

now split the equation in half

CH4+O2                 I                  CO2 + 4H2O

C = 1                      I                  C = 1                    

H = 4                      I                  H = 8

O = 2                      I                 O = 3


CH4+ 2O2 = CO2 + 2H20

Answer:

[tex]\huge \boxed{\mathrm{CH_4+ 2O_2 \Rightarrow CO_2 +2 H_2O}}[/tex]

[tex]\rule[225]{225}{2}[/tex]

Explanation:

[tex]\sf CH_4+ O_2 \Rightarrow CO_2 + H_2O[/tex]

Balancing the Hydrogen atoms on the right side,

[tex]\sf CH_4+ O_2 \Rightarrow CO_2 +2 H_2O[/tex]

Balancing the Oxygen atoms on the left side,

[tex]\sf CH_4+ 2O_2 \Rightarrow CO_2 +2 H_2O[/tex]

[tex]\rule[225]{225}{2}[/tex]