Question

law of constant proportions

Answer 1

Hey user !!!!

According to law of constant proportion,,
The total no of products is always equal to thr total no . of reactants..
For example ::- in water,, The ratio of hydrogen and oxygen present in the reaction is always 1:8.. that is 1 atom of hydrogen combines with 8 atoms of oxygen to form water molecule( H2O)

this law was given by " JOSEPH. L PROUST"

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Answer 2

Law of definite or constant proportions:

→This law was presented by Proust in 1799.

→ Definition : A chemical compound always contains the same element combined together in fixed proportion by mass, i.e., a chemical compound has a fixed composition and it does not depend on the method of its preparation or the source from which it has been obtained.

→For example, carbon dioxide can be obtained by using anyone of the following methods:

(a) by heating calcium carbonate,

(b) by heating sodium bicarbonate,

(c) by burning carbon in oxygen,

(d) by reacting calcium carbonate with hydrochloric acid.

Whatever sample of carbon dioxide is taken, it is observed that carbon and oxygen are always combined in the ratio of 12 : 32 or 3 : 8.

→The converse of this law that when same elements combine in the same proportion, the same compound will be formed, is not always true.

For example, carbon, hydrogen and oxygen when combine in the ratio of 12 : 3 : 8 may form either ethyl alcohol (C2H50H) or dimethyl ether (CH30CH3 ) under different experimental conditions.