How many molecules of sulphur are present in 64.0g of suphur(S8)? (atomic mass of sulphur is 32u).
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Answer:
molecular mass of S8=32×8=256 g
i.e. 256g of S8 contain 6.022×10^ 23 molecules
so, 64g of S8 contain =6.022×10^23× 64÷256
= 1.505×10^23 molecule
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