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A specified pure compound has a fixed elemental mass composition, apart from isotopic variation, nonstoichiometry, and sample impurity.
wp-chem-stoichiometryopenstax-chemistry-2eiupac-gold-bookEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Proust’s comparative analyses materially supported acceptance of fixed composition as a criterion distinguishing compounds from mixtures.
The source experiment, observation, anomaly, or problem materially motivated the development, revision, or acceptance of the target concept. Historical influence is not logical derivation; the edge detail states the documented role and avoids retrospective origin myths.
wp-chem-definite-proportionsopenstax-chemistry-2eEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
The law describes stoichiometric compounds while allowing explicit qualifications for isotopes and nonstoichiometric solids.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
wp-chem-stoichiometryopenstax-chemistry-2eiupac-gold-book