The formula of a compound represents

The correct option is D

All of the above

Explanation for the correct option:

Option D

Chemical formula:

• The formula of a substance is the symbolic representation of a chemical substance.
• To write the formula of a chemical substance, the valency and the symbol of the various atoms or radicals present in it must be known.
• The chemical formula represents the name of the compound, elements constituting the compound and the molecular weight of the compound, and the relative weights of different elements present in it.
• For example, the chemical formula of sulphuric acid is ${\mathrm{H}}_2{\mathrm{SO}}_4$.

Therefore, option D is correct.