What is wrong with the chemical equation below? how could you fix it? ch4 + o2 → co2 + 2 h2o

CH4+O2  =  CO2+2H2O

C-1               C-1    

O-2              O-4

H-4               H-4

CH4+2 O2  =  CO2+2 H2O

C-1               C-1    

O-2-4           O-4

H-4               H-4

You add a 2 in front of the O2 on the reactant side so the Oxygen can balance on the Product side