How many atoms are in 0.7 grams of Helium?

Answer 1

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

Answer 2

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

Answer 3

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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Answer 4

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

Answer 5

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