Question

state the laws of definite proportions and multiple proportions. illustrate each with an example.

Answer 1

Law of definite proportion: It is also known as Proust's law

It says that the proportion of elements in a given chemical compound will be constant irrespective of source of chemical compound or method of synthesis

For example: CaCO3

Calcium carbonate will always contain the elements in the ration as

Ca : C : O = 1:1:3

2) Law of Multiple proportion:

In case of combination of two elements to give more than one kind of compound [for example H can combine with O to form either H2O or H2O2] then the proportion of the masses of the an element [Here O] which combine with a particular mass of the other element will be in small whole numbers.

Here the ratio of masses of Oxygen in both the compounds will be:

1:2