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How many helium atoms are present in 0.2kg of helium?

How many helium atoms are present in 0.2kg of helium?
 

Grade:10

1 Answers

Newton Shaji
35 Points
9 months ago
No of moles of he =weight of helium/molar mass of helium =0.2 kg/ 4g = 50 moles 
No of molecules = no of moles x Avogadro number = 50 x 6.023 x 10^23 = 3.01 x 10^25 atoms

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