Balance the equation: $$C_3H_8+O_2\rightarrow CO_2+H_2O$$.
- First we need to balance the elements other than oxygen and hydrogen on both sides.
$$C_3H_8 + O_2 \rightarrow 3CO_2 +H_2O$$- Now, balance the number of hydrogens on both sides:
$$C_3H_8 + O_2 \rightarrow 3CO_2 + 4H_2O$$
- Lastly balance the number of oxygens on both sides:
$$C_3H_8 + 5 O_2 \rightarrow 3CO_2 + 4H_2O$$