The number of molecules of sulphur (S8) present in 16 g of solid sulphur is

To find the number of molecules in 16g of solid sulphur (S8), we need to follow these steps:

1. First, we need to find the molar mass of S8. Since the atomic mass of sulphur (S) is approximately 32g/mol, the molar mass of S8 would be 32g/mol * 8 = 256g/mol.

2. Next, we use the formula for moles which is Moles = mass / molar mass. Substituting the given mass (16g) and the molar mass we calculated (256g/mol), we get Moles = 16g / 256g/mol = 0.0625 mol.

3. Finally, we use Avogadro's number (6.022 x 10^23 molecules/mol) to find the number of molecules. The formula is Number of molecules = Moles * Avogadro's number. Substituting the values, we get Number of molecules = 0.0625 mol * 6.022 x 10^23 molecules/mol = 3.76 x 10^22 molecules.

So, there are approximately 3.76 x 10^22 molecules of S8 in 16g of solid sulphur.