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14 September, 08:50

What is the mass in grams of 6.5*10^20 molecules of aspirin (C9H8O4) ?

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  1. 14 September, 11:25
    0
    We have a couple of steps to do:

    1. Figure out the number of moles of Aspirin using Avogadro's Number

    2. find the molar mass of Aspirin

    3. Calculate the mass in grams

    [1]. 6.5 x 10^20 molecules x (1 mole / 6.022 x 10^23 molecules) = 1.08 x 10^-3 moles Aspirin

    [2]. Using the atomic masses from the periodic table for each element C, H, and O, find the molar mass of Aspirin (9 x 12.011) + (8 x 1.008) + (4 x 15.999) = 108.099+8.064+63.996 = 180.159 grams/mole

    [3]. multiply to find the answer:

    1.08 x 10^-3 moles x (180.159 grams/mole) = 0.195 grams (moles cancel out)

    Since the given answer only has two significant figures, the answer should only express in 2 sig figs, too:

    2.0 x 10^-1 grams Aspirin
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