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13 November, 13:37

18. How many moles of atoms are there in each of

the following? (Hint: See Sample Problems C

and D.)

a. 6.022 x 1023 atoms Ne c. 3.25 x 105 g Pb

b. 3.011 x 1023 atoms Mg d. 4.50 x 10-12 g O

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Answers (1)
  1. 13 November, 13:44
    0
    a) 1 mole of Ne

    b) i/2 mole of Mg

    c) 1570 moles of Pb.

    d) 2.18125*10^-13 moles of oxygen.

    Explanation:

    The number of moles calculated by Avogadro's number in 6.23*10^23 of Neon.

    6.23*10^23 = 1 / 6.23*10^23

    = 1 mole

    The number of moles calculated by Avogadro's number in 3.01*10^23 of Mg

    3.2*10^23=1/6.23*10^23

    = 1/2 moles of Pb.

    Number of moles in 3.25*10^5 gm of lead.

    atomic weight of Pb=

    n=weight/atomic weight

    = 3.25*10^5 / 207

    = 1570 moles of Pb.

    Number of moles 4.50 x 10-12 g O

    number of moles = 4.50*10^-12/16

    = 2.18125*10^-13 moles of oxygen.
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