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12 April, 08:48

An aspirin tablet contains 325.0 mg of aspirin, which has the molecular formula, C9H8O4. How many molecules of aspirin are in the tablet?

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  1. 12 April, 09:42
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    1.08X10²¹ molecules aspirin are in the tablet

    Explanation:

    Molar mass of aspirin is 180.15 g/m (C₉H₈O₄)

    This data means that 1 mol weighs 180.15 g so:

    325 mg = 0.325 g

    If 180.15 g are contained in 1 mol of aspirin

    0.325 g (which is the weight from the tablet) are contained in ...

    (0.325 g. 1m) / 180.15 g = 1.80x10⁻³ moles

    1 mol has 6.02x10²³ molecules (NA)

    1.80x10⁻³ moles are contained by ...

    1.80x10⁻³. NA = 1.08X10²¹ molecules
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