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14 December, 10:59

How many atoms of carbon are in 24 grams of carbon?

a) 1.2 x 10²⁴ atoms

b) 1.7 x 10²⁶ atoms

c) 1.2 x 10²⁵ atoms

d) 3.0 x 10²⁴ atoms

e) 3.0 x 10²³ atoms

Can anyone explain this one?

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Answers (1)
  1. 14 December, 12:49
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    (3 grams of carbon) x (1 mole of carbon/12 grams) = 3/12 = 1/4 of a mole of carbon. Then ... (1/4 of a mole) x (6.02 x 10^23 atoms/mole) = approximately 1.5 x 10^23 atoms.
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