Calculate the number of molecules of sulphur `(S_(8))` present in 16 g of solid sulphur.

Explanation

The molecular formula of sulphur is given to the be ` S_(8)` (it contains 8 atoms of sulphur). So, the molecular mass of sulphur molecular is `32 xx 8 = 256 u`. This means that 1 mole of sulphur molecules is equal to `256` grams.
Now, `256` g of sulphur = 1 mole of sulphur molecules
So, 16 g of sulphur ` = 1/256 xx 16` mole of sulphur molecules
`= 0.625` mole of sulphur molecules
Also, 1 mole of sulphur molecules `= 6.023 xx 10^(23)` molecules
So, `0.0625` mole of sulphur molecules `= 6.023 xx 10^(23) xx 0.0625` molecules
`= 3.76 xx 10^(22)` molecules