The law of substitution, also known as the law of constant proportions, states that in a chemical compound, elements are always present in fixed, definite proportions by mass. This means that the ratio of the masses of the elements in a compound is constant, regardless of the source or method of preparation of the compound.
In the provided table, we have two samples of the compound ABC. The law of substitution tells us that the ratio of the masses of Element A to Element B to Element C will be the same in both samples, regardless of the actual masses.
In the provided diagram, each circle represents an atom of an element (A, B, or C), and the lines connecting them represent the chemical bonds in the compound ABC. The law of substitution implies that regardless of the arrangement or number of atoms, the ratio of the masses of the elements (A:B:C) remains constant.
