If sulphur exists as S8 molecules, calculate the number of moles in 100 g of sulphur. (S = 32 u)
Given mass of sulphur, S8 = 100g
Atomic mass of sulphur, S8 = 32 × 8 g = 256g
Number of moles = Given mass of the element / Atomic mass of the element
Number of moles = 100/ 256 = 0.39 moles.