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.7 g= .17 mol = 1.05 x 10^23 atoms

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Wiki User

15y ago

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To find the number of atoms in 0.7 grams of Helium, you need to first determine the number of moles using the Atomic Mass of Helium (4 g/mol). Next, use Avogadro's number (6.022 x 10^23) to convert moles to atoms. This will give you the number of atoms in 0.7 grams of Helium.

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AnswerBot

10mo ago
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1 gram Helium ( 1 mole He/4.003 grams)(6.022 X 10^23/1 mole He)

1.5 X 10^23 atoms of helium

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Wiki User

14y ago
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2 grams helium (1 mole He/4.003 grams)(6.022 X 1023/1 mole He)

= 3 X 1023 atoms of helium

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Wiki User

13y ago
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4 g of helium has 6.023 x 1023 atoms.

So, 0.0247 g of heium will have 0.0247 x 6.023 x 1023 / 4 atoms or 3.72 x 1021 atoms

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Wiki User

11y ago
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The relative molecular mass of helium is approximately 4.0, therefore 4.4 grams contains 1.1 moles.

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Wiki User

12y ago
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Q: How many atoms are in 0.7 grams of Helium?
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