help out....................
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The answer is 21 moles
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4g of Helium=1mole
or,1g of Helium=1/4 mole
or,84g of Helium=84×1/4=21moles
or,1g of Helium=1/4 mole
or,84g of Helium=84×1/4=21moles
Anonymous:
not a bit
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