Question

How can I balance a combustion reaction?

Answer 1

Exemple

In combustao of methane ( CH4 )

CH4 + O2 = CO2 + H2O

C is balanced

To balance H multiply H2O on the right by 2

CH4 + O2 = CO2 + 2 H2O

To balance O multiply O2 on the right by 2

CH4 + 2 O2 = CO2 + 2 H2O

Hope this helps!