Atoms and Molecules — Science STD 9 — Question

4. 3.78 × 10²³ molecules.

Explanation:

Molar mass of S₈ = 256g mol^-1

We know,

1 mole of S₈ = Molar mass of S8 = 6.022 × 10²³ molecules.

256g of S₈ = 6.022 × 10²³ molecules.

Hence, 16g of S₈ $=\frac{6.022\times10^{23\times}16}{256}$ molecules

= 3.76 × 1022 molecules

= 3.76 × 10²² molecules

= 3.78 × 10²³ molecules (approx)