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[" 16.One atom of an element "x" weigh "...

[" 16.One atom of an element "x" weigh "6.643times10^(-23)" g.Number of moles of atom in "20kg" is: "],[[" (a) "4," (b) "40," (d) "500,100," (c) "]]

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One atom of an element x weight 6.643xx10^(-23)g . Number of moles of atom in 20 kg is :

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