How to determine empirical formula from combustion analysis

Galaxies on Instagram: "The experiment shown here was carried out on the International Space Station to see how combustion happens in a 0g environment. They used a 50/50 fuel mixture of iso-octane and heptane, tested in a standard air environment (21% oxygen and 79% nitrogen at 1 atm). The results are quite interesting. The only glaringly obvious feature is that the flame looks spherical. The reason for that is simply that it has no reason to look otherwise. On Earth, gravity creates an axis tha