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Antoine Lavoisier and Joseph Proust contributed to the development of the law of conservation of mass and the law of definite proportions.

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SUPPORTED
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Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

AS REPORTEDno primary record reached; this is what the reporting says

Is it true that Antoine Lavoisier and Joseph Proust contributed to the development of the law of conservation of mass and the law of definite proportions?

Yes. Antoine Lavoisier contributed to the law of conservation of mass, and Joseph Proust formulated the law of definite proportions (or constant composition), as confirmed by historical sources.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

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Judged against reference works: claims of this kind are settled by the historical reference record, not journal abstracts.

Evidence for · 4
LibreTexts: LibreTexts: 2.04: Observations Supporting Atomic Theory The Conservation of Mass and the Law of Definite Proportions
States that Lavoisier's conservation of mass and Proust's law of definite proportions are fundamental chemical laws.
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LibreTexts: LibreTexts: 2.04%3A Observations Supporting Atomic Theory   The Conservation of Mass and the Law of Definite Proportions. (n.d.). LibreTexts. https://chem.libretexts.org/Courses/Ontario_Tech_University/ON_Tech_CHEM_1010/02%3A_Atoms_Molecules_and_Ions/2.04%3A_Observations_Supporting_Atomic_Theory_-_The_Conservation_of_Mass_and_the_Law_of_Definite_Proportions

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More for · 3
Wikisource: Wikisource: 1911 Encyclopædia Britannica/Chemistry
Mentions Lavoisier's assumptions and Joseph Proust's work on constant composition.
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Wikisource: Wikisource: 1911 Encyclopædia Britannica/Chemistry. (n.d.). Wikisource. https://en.wikisource.org/wiki/1911_Encyclopædia_Britannica/Chemistry

Wikiversity: Wikiversity: High School Chemistry/Atomic Structure, The Periodic Table, and Electrons or Light
Explicitly notes that Lavoisier proposed the Law of Conservation of Mass and Proust the Law of Definite Proportions.
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Wikiversity: Wikiversity: High School Chemistry/Atomic Structure, The Periodic Table, and Electrons or Light. (n.d.). Wikiversity. https://en.wikiversity.org/wiki/High_School_Chemistry/Atomic_Structure,_The_Periodic_Table,_and_Electrons_or_Light

LibreTexts: LibreTexts: Proust's Law of Constant Proportion
Links Lavoisier's conservation of mass to Proust's formulation of the law of constant composition.
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LibreTexts: LibreTexts: Proust's Law of Constant Proportion. (n.d.). LibreTexts. https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Atomic_Theory/Dalton's_Atomic_Theory/Proust's_Law_of_Constant_Proportion

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