Question

Give three pieces of information conveyed by the formula H₂O.

Answer 1

Molecular formula H₂O conveys that one molecule of water is composed of two types of elements: hydrogen and oxygen. It also tells about the chemical composition of the compound; i.e., one molecule of water consists of two atoms of hydrogen and one atom of oxygen. Also, by knowing the atomic masses of oxygen and hydrogen elements, molecular mass of water can be evaluated.
Molecular mass of water = [(2$\times$1) + (1$\times$16)] g = 18 g mol⁻¹