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Figure 1. The molecular structure of caffeine. Caffeine belongs to the family of heterocyclic compounds known as purines. It has the systematic name 3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione; it is also known as 1,3,7-trimethylxanthine, and 1,3,7-trimethyl-2,6-dioxopurine.
1 Find empirical/molecular formula of caffeine, which contains 49.5% carbon, 5.15% hydrogen, 28.9% nitrogen, 16.5% oxygen. It has a molar mass of 195 g.  Find empirical/molecular formula for nicotine (contains carbon, hydrogen, nitrogen) if 5.250 mg nicotine combusted to form 14.242 mg CO2 and 4.083 mg H2O.