Which French chemist summarised his experiment in 1806, and proved that the mass ratio of elements in a chemical compound is always the same, regardless of the source of the compound?
A.Joseph Proust✓ Correct
B.John Dalton
C.Robert Boyle
D.Jacob Berzelius
Explanation
Joseph Proust proposed the Law of Definite Proportions (Proust's Law) in 1806, establishing that elements in a compound always combine in fixed mass ratios regardless of origin.
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