Question

question:
- what is the law of constant proportion? explain with example.
- which postulate of Dalton's atomic theory is in agreement with this law? ​

Answer 1

Answe

• The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by mass. ... For example, in a nitrogen dioxide (NO2) molecule, the ratio of the number of nitrogen and oxygen atoms is 1:2 but the mass ratio is 14:32 (or 7:16).
• 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. ... This is law of constant proportion.

Answer 2

$\bf\underline{\underline{¡!Questions:}}$

1] What is the law of constant proportion? Explain with example.

2] Which postulate of Dalton's atomic theory is in agreement with this law?

$\bf\underline{\underline{!¡Required ~Answer:}}$

1] In a chemical substance, the elements are always present in definite proportion by masses.

Example:- Hydrogen and oxygen combining in the ratio of 1:8 to form water.

2] Relative number of mass atoms which combine to form molecules is constant in a compound.