What did Joseph Proust state regarding the Law of Constant Proportions?

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A given compound always contains absolutely the same proportion of moles by weight

A given compound always contains absolutely the same proportions of elements by weight

A given mixture always contains absolutely the same proportion of elements by weight

A given compound always contains absolutely the same proportion of elements by volume

answer is A.

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Detailed Solution

When Joseph Proust worked on the composition of elements present in a compound experimentally, he found out that it was the same for all the samples he took. He concluded that from any source, a particular compound always contains the same elements in the same proportion by weight or mass.

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