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11.0 g sample. 3.0 g C. 8.0 g Oxygen.
mols C = 3.0/12 = 0.25
mols O = 8.0/16 = 0.5
Convert to whole numbers with no number being smaller than 1.0.
mols C = 0.25/0.25 = 1.00
mols O = 0.50/0.25 = 2.00 so formula is CO2