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4 September, 12:38

How many atoms are found in 12.0 grams of Helium?

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  1. 4 September, 13:24
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    Each mole contains Avagodro's number of atoms i. e. 6.023x10^23, so

    3 moles x 6.023x10^23 atoms/mole = 18.069x10^23 atoms = 1.8x19^24 atoms
  2. 4 September, 16:38
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    One mole of helium has a mass of 4.0 grams. In 12 grams there are 3 moles of He. Each mole contains 6.022x10^23 atoms of helium. Therefore, 3 moles of He will contain 3 times as many atoms or 1.806x10^24 atoms.
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