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The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by mass.
-Group 5

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Law of constant proportions was given by Joseph Proust in 1799.
- Group 5

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Joseph Proust

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3:8

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Law of Definite Proportion

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Calcium+ oxygen= Calcium Oxide
40+16=Calcium oxide
40/16=20/8=10/4=5/2=5:2
So 5g of calcium is required to combine with oxygen
By Eshita, Punnya and Nandana