State and explain the law of definite proportions.

Answer»

Law of definite proportions :

i. The law states that “A given compound always contains exactly the same proportion of elements by weight”.

ii. French chemist, Joseph Proust worked with two samples of cupric carbonate; one of which was naturally occurring cupric carbonate and other was synthetic sample.

He found the composition of elements present in both the samples was same as shown below :

Cupric carbonate	% of copper	% of carbon	% of oxygen
Natural sample	51.35	9.74	38.91
Synthetic sample	51.35	9.74	38.91

iii. Thus, irrespective of the source, a given compound always contains same elements in the same proportion.

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