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11 September, 12:36

Determine the empirical and molecular formula:

Ibufuren, a headache remedy contains 75.6% C, 8.08% H, and 15.5% O by mass and has a molar mass about 206 g/mol.

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  1. 11 September, 12:54
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    The empirical formula = molecular formula = C13H18O2

    Explanation:

    in 100% compound we have 75.6 % Carbon (Molar mass = 12g/mole), 8.80% hydrogen (Molar mass = 1.01 g/mole) and 15.5% Oxygen (Molar mass = 16.01 g/mole).

    Carbon: 75.6g / 12 = 6.29

    Hydrogen: 8.80 / 1 = 8.80

    Oxygen: 15.5 / 16 = 0.97

    ⇒0.97 is the smallest so we divide everything through by 0.97

    C: 6.29 / 0.97 = 6.48 ≈ 6.5

    H: 8.80 / 0.97 = 9

    O: 0.97 / 0.97 = 1

    To get rid of decimals, we multiply by 2

    C: 6.5 x 2 = 13

    H: 9 x 2 = 18

    O: 1 x 2 = 2

    The empirical formula = C13H18O2

    13x 12g/mol + 18x1g/mol + 2x 16g/mol = 156 + 18 + 32 = 206g/mol which is the molar mass of ibuprofen

    The empirical formula = molecular formula = C13H18O2
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