which represents the greatest number of atoms: 100g of Mg, 100g of S, 100g of Br, 100g of Rn need answer and a short expla

Question

which represents the greatest number of atoms: 100g of Mg, 100g of S, 100g of Br, 100g of Rn

need answer and a short explanation pls​

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Đan Thu 5 months 2021-08-22T05:51:30+00:00 1 Answers 28 views 0

Answers ( )

    0
    2021-08-22T05:53:16+00:00

    Explanation:

    100 grams of magnesium:

    1 mole of Mg atom = 6.022×10

    23

    atoms

    This means 24g of Mg has 6.022×10

    23

    atoms

    Then 100 g contains:

    Number of Mg atoms=

    Molar mass

    Given mass

    ×6.022×10

    23

    Number of atoms=

    24

    100

    ×6.022×10

    23

    Number of Mg atoms = 2.5×10

    24

    atoms

    100 grams of aluminium:

    1 mole of atom= 6.022×10

    23

    atoms

    This means 27g of Al has 6.022×10

    23

    Then 100 g contains:

    Number of Al atoms=

    Molar mass

    Given mass

    ×6.022×10

    23

    Number of Al atoms=

    27

    100

    ×6.022×10

    23

    Number of Al atoms= 2.2×10

    24

    atoms

    Thus, 100g of magnesium has more atoms.

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