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Calculate the number of molecules of sulphur (S8) present in 16g of solid sulphur

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 1 mole of solid sulphur (S8) = 8 × 32g = 256

i.e., 256g of solid sulphur contains = 6.022 × 1023 molecules 

Then, 16g of solid sulpur contains 6.022×1023 /256 × 16 molecules 

= 3.76 × 1022 molecules (approx)

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