The questions says: Caffeine contains C,H,O and N. Combustion of 1.000 mg of Caffeine produces 1.813 mg CO2, 0.4649 mg H20 cand 0.2885 mg N2. Estimate the molar mass of caffeine which lies between 150 and 200 g/mol.
First of all what are the calculations because I'm lost. Also, wtf is Molar Mass and how do you even calculate the empirical formula when it has molecules.