Nora,HowGan

(a) The characteristic odor of pineapple is due to ethyl butyrate, a compound containing carbon, hydrogen, and oxygen. Combustion of 4.45 mg of ethyl butyrate produces 10.11 mg of CO2 and 4.13 mg of H2O. What is the empirical formula of the compound?

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3 months ago 1

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  1. Roger the Mole

    (10.11 x 10^-3 g CO2) / (44.00964 g CO2/mol) × (1 mol C / 1 mol CO2) = 0.000229722 mol C
    (0.000229722 mol C) × (12.01078 g C/mol) = 0.0027591 g C

    (4.13 x 10^-3 g H2O) / (18.01532 g H2O/mol) × (2 mol H / 1 mol H2O) = 0.00045850 mol H
    (0.00045850 mol H) × (1.007947 g H/mol) = 0.00046214 g H

    (4.45 x 10^-3 g total) - (0.0027591 g C) - (0.00046214 g H) = 0.00122876 g O
    (0.00122876 g O) / (15.99943 g O/mol) = 0.000076800236 mol O

    Divide by the smallest number of moles:
    (0.000229722 mol C) / 0.000076800236 mol = 2.991
    (0.00045850 mol H) / 0.000076800236 mol = 5.970
    (0.000076800236 mol O) / 0.000076800236 mol = 1.000

    Round to the nearest whole numbers to find the empirical formula:
    C3H6O

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