Question

calculate the number of molecules of sulphur (S8) present in8 g of solid sulphur.calculate the number of molecules of sulphur (S8) present in8 g of solid sulphur.

Answer 1

Atomic mass of sulphur=32u
Since sulphur is found as molecule of formula S8
Molar mass of sulphur= 256g = 1 mole
Number of S8 molecules in 256g of solid sulphur= 6.022×10²³
Number of molecules in 8g of solid sulphur= 6.022×10²³× 8/256
=1.88 ×10²² molecules are present in 8g of solid sulphur.