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20 February, 22:54

The mass in grams of 2.75 x 1021atoms of Li is.

a.

0.3017 g

c.

3.017 g

b.

0.0317 g

d.

0.00317 g

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Answers (1)
  1. 20 February, 23:09
    0
    The mass in grams of 2.75 x10^21 is calculated as

    by use of avogadros law

    1mole = 6.02 x 10 ^23 atoms

    what of 2.75 x 10^23 atom

    2.75 x 10^21atoms x 1mole / 6.02 x 10^23 = 4.568 x10 ^-3moles

    mass is therefore = moles x molar mass of lithium (6.941)

    that is (4.568 x 10^-3) x 6.941 = 0.0317 grams
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