JAMB Chemistry 2024 Paper

Oxide of Sulphur means the compound formed is bonding between Sulphur and Oxygen.

Also, if the compound contains 60% Oxygen, then it must contain 40% Sulphur

Elements S O

%by mass of atoms 40 60

Divide by their masses $\;\frac{40}{32}$ $\;\frac{60}{16}$

1.25 3.75

Divide through by smaller value $\;\frac{1.25}{1.25}$ $\;\frac{3.75}{1.25}$

1 : 3

Empirical formula SO$_{3}$