Define the law of multiple proportions, Explain it with two examples. How des this law point to the existence of atoms?

Explanation

Law of multiple proportions was first studied by Dalton in 1803 which may be defind and follows
When two elements combine to form two or more chemical compounds, then the masses of one of the elements which combine with a fixed mass of the other, bear a simple ratio to one another.
e.g., hydrogen combines with oxygen to form two compounds, namely, water and hydrogen peroxide.
`"Hydrogen"+"Oxygen"rarr"water"`
2g 16g 18g
`"Hydrogen"+"Oxygen"rarr"Hydrogen peroxide"`
`2g 32g 34g`
Here the masses of oxygen (i.e. 16g and 32g) which combine with a fixed mass of hydrogen (2g) bear is simple ratio i.e. 16:32 or 1:2.
As we know that, when compounds mixed in different proporionation then they form different compounds in the above example when hydrogen is mixed with different proportion of oxygen then they form water or hydrogen peroxide.
It shows that there are consitutents which combine in a definte proprotion These consituents may be atoms Thus the law of multiple proportions shows the existence of atoms wich combine into molecuels.