How many helium atoms are present in 0.2kg of helium?
Kalpana kc , 4 Years ago
Grade 10
10 grade science> How many helium atoms are present in 0.2k...
1 Answers
Newton Shaji
Last Activity: 4 Years 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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