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valentina_108 [34]
3 years ago
10

How many moles are in 12.013 x 10 ^24 atoms of helium?

Chemistry
1 answer:
Alex17521 [72]3 years ago
7 0

Answer:

19.948 mol.

Explanation:

  • <em>Knowing that every one mole of a substance contains Avogadro's no. of molecules (NA = 6.022 x 10²³).</em>

<u><em>Using cross multiplication:</em></u>

1.0 mole → 6.022 x 10²³ atoms of He.

??? mole → 12.013 x 10²⁴ atoms of He.

∴ The no. of moles of are in  12.013 x 10²⁴ atoms of He = (12.013 x 10²⁴ atoms of He) (1.0 mole) / (6.022 x 10²³ atoms of He) = 19.948 mol.

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Answer in the Word document below.
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7 0
3 years ago
6. If 0.500 mol NaN3 react, what mass in grams of nitrogen will result?
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Answer:

21 g of N₂ are produced by the decomposition

Explanation:

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