# How do you calculate empirical formula of a combustion?

Empirical formula are generally determined by combustion reactions. An accurate mass of hydrocarbon ${C}_{n} {H}_{m} {N}_{n} {O}_{o}$ is dropped into a furnace. The combustion products. $C {O}_{2}$, ${H}_{2} O$, $N {O}_{2}$ are shunted to a gas chromatograph. Their concentrations are compared to a standard, and a very accurate percentage composition with respect to $C$, $H$, $N$, may be determined.