Answer:
CH4 + 2O2 —> CO2 + 2H2O
CH4 + 2O2
C = 1
H = 4
O = 2 ×2 = 4
__o_o___
CO2 + 2H20
H = 2 × 2 = 4
O = 2 + 2 = 4
So ; 1 C , 4 H , 4 O
I hope I helped you^_^
