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Calculate the number of atoms present in 6.4 g of sulphur.

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Number of mole = weight/ atomic weight
                       = 6.4/32
                       = 0.2 mole
1 mole = 6.023 X 1023 atom
hence
0.2 mole - 0.2 X 6.023 X 1023 atom
0.2 mole = 1.2046X 1923  atom 

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sudhir.kumar

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