Question

Calculate the numbers of molecules of sulphur (S8)
present in 16g of Solid Sulphur.​

Answer 1

1 mole of solid sulphur (S8) = 8 x 32 g = 256 gi.e., 256 g of solid sulphur contains = 6.022 x 1023 molecules

Then, 16 g of solid sulphur contains = 6.022 x 1023 / 256 = 16 molecules

= 3.76375 x 1022 molecules

Answer 2

Explanation:

To calculate molecular mass of sulphur:

Molecular mass of Sulphur (S8) = 8xMass of Sulphur = 8×32 = 256g

Mass given = 16g

Number of moles = mass given/ molar mass of sulphur

= 16/256 = 0.0625 moles

To calculate the number of molecules of sulphur in 16g of solid sulphur:

Number of molecules = Number of moles x Avogadro number

= 0.0625 x 6.022 x 10²³ molecules

= 3.763 x 10²² molecules