x; "/Many combustion reactions are hard to balance because of the oxygen in both the CO2 and H2O. Often a mixed fraction of for the O2 will balance...

x; "></Many combustion reactions are hard to balance because of the oxygen in both the CO2 and H2O. Often a mixed

fraction of ½ for the O2 will balance the equation. Only thing is you can’t have a fraction for a coefficient.

Therefore, you double ALL the coefficients when this happens.

Example: Balance C4H10 + O2 → CO2 + H2O