# How would you balance: C3H8 + O2 --> CO2 + H2O?

${C}_{3} {H}_{8} \left(g\right) + 5 {O}_{2} \left(g\right) \rightarrow 3 C {O}_{2} \left(g\right) + 4 {H}_{2} O \left(g\right)$
Is mass balanced here? How do you know? Suppose some of the oxidation product was $C O$; how would you represent this?