A peer substance has a definite fixed composition hypothesis or theory or scientific law

Answer 1

The hypothesis for a peer substance having a definite fixed composition would be that all substances are made up of specific elements in specific proportions. This idea is based on the theory of atomic theory, which states that elements are made up of individual atoms that combine in fixed ratios to form compounds. This theory is supported by the law of definite proportions, which states that a compound will always have the same ratio of elements by mass regardless of the source or method of preparation.