538 kg * 1000(g/kg) / 4.003 (g/mol) * 6.022*1023 (atoms/mol) = 8.09*1018 atoms He in 538 kg gas
Quite a few! 533 kg Helium (1000 grams/1 kg)(1 mole He/4.003 grams)(6.022 X 1023/1 mole He) = 8.02 X 1028 atoms of helium ---------------------------------------
553Kg He (1000g/1kg )(1mol He/4.003g )(6.022 X 10^23/1mol He )= 8.32 X 10^28 atoms of Helium
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Helium does not form molecules but exists as individual atoms.