Question
Tue January 10, 2012 By:

WHICH POSTULATE OF DALTON ATOMIC THEORY SUPPORTS LAW OF CONSTANT PROPORTION?

Expert Reply
Wed January 11, 2012

According to the 6th postulate of Dalton’s atomic theory, atoms of each element are similar and have same weight and atoms of one element combine with atoms of another element to form compounds. Hence the sixth postulate explains the law of constant proportions. For example:  

We have a molecule of carbon dioxide. It is made up of one carbon atom and two oxygen atoms. This is law of constant proportion. The mass of carbon atom is 12 u and mass of oxygen is 16 u so in carbon dioxide, carbon and oxygen combine in the fixed ratio of 3:8 by mass i.e. composition of various elements in a compound is fixed. This is the law of constant proportion.

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