# Problem: 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?

###### FREE Expert Solution

Recall that in combustion analysisa 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 CO2y H2O

mole-to-mole comparison:

• 1 mole of C in 1 mole of CO(molar mass = 44.01 g/mol or mg/mmol)
• 2 moles of H in 1 mole of H2(molar mass = 18.02 mg/mmol)

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 ###### Problem Details

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?