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22 August, 12:36

Find the number of ibuprofen molecules in a tablet containing 200.0 mg of ibuprofen (c13h18o2). express the amount to four significant figures.

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  1. 22 August, 12:45
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    First let us calculate for the molar mass of ibuprofen:

    Molar mass = 13 * 12 g/mol + 18 * 1 g/mol + 2 * 16 g/mol

    Molar mass = 206 g/mol = 206 mg / mmol

    Calculating for the number of moles:

    moles = 200 mg / (206 mg / mmol)

    moles = 0.971 mmol = 9.71 x 10^-4 moles

    Using the Avogadros number, we calculate the number of molecules of ibuprofen:

    Molecules = 9.71 x 10^-4 moles * (6.022 x 10^23 molecules / moles)

    Molecules = 5.85 x 10^20 molecules
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