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15 December, 17:05

Calculate the number of atoms in each sample. a. 14.955 g Cr b. 39.733 g S c. 12.899 g Pt d. 97.552 g Sn

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  1. 15 December, 17:15
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    (a) 1.5*10^23 atoms

    (b) 7.47*10^23 atoms

    (c) 3.98*10^22 atoms

    (d) 4.93*10^23 atoms

    Explanation:

    Number of atoms = number of moles * 6.02*10^23

    (a) 14.955 g Cr = (14.955/60) * 6.02*10^23 = 1.5*10^23 atoms

    (b) 39.733 g S = (39.733/32) * 6.02*10^24 = 7.47*10^23 atoms

    (c) 12.899 g Pt = (12.899/195) * 6.02*10^23 = 3.98*10^22 atoms

    (d) 97.552 g Sn = (97.552/119) * 6.02*10^23 = 4.93*10^23 atoms
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