what is law of constant proportion??
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Law of constant proportion states that a pure chemical compound always contain same elements combined together in the same definite proportion by weight .
it was given by Joseph Proust.
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A molecule of water will always have two hydrogen atoms and one oxygen atom, meaning that in a bottle of pure water the hydrogen to oxygen atom ratio will always be 2:1. This seems very logical to us today. But 300 years ago, scientists didn't understand compounds this way. However, in 1794, Joseph Proust published the Law of Constant Proportions, which says that a chemical molecule will always contains the same elements in the same proportion.
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