Question

How many molecules of sulphur are present in 64.0g of suphur(S8)? (atomic mass of sulphur is 32u).

Answer 1

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