You take 4 tablets of aspirin (a compound that contains carbon, hydrogen, and oxygen) and perform a combustion reaction by burning the 4 tablets in the presence of air, which produces 2.20 g CO2 and 0.400 g H2O.  If each tablet weighs 5.51 x 10-4 lbs, and the molar mass is 180.1 g/mol, what is the molecular formula of aspirin?

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".