Recall that in combustion analysis, a compound reacts with excess O2 to form products.
For a compound composed of C, H, and O, the reaction looks like this:
CxHyOz + O2 (excess) → x CO2 + y H2O
Finding the mass of C and H:
mass of C = 1.897 mg C
mass of H = 0.318 mg H
mass of O = 3.06 mg – (1.897 mg C + 0.318 mg H) = 0.8446 mg O
The characteristic odor of pineapple is due to ethyl butyrate, a compound containing carbon, hydrogen, and oxygen. Combustion of 3.06 mg of ethyl butyrate produces 6.95 mg of CO2 and 2.84 mg of H2 O. What is the empirical formula of the compound?
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