Q. 273.8( 6 Votes )

State the two important laws of chemical combination. How Dalton’s atomic theory explains the two Laws?

Answer :

The two important laws of chemical combination are:

i) Law of constant proportion:


The law states that “in a chemical substance, the elements are always present in definite proportions by mass.


For example: In ammonia (NH3), nitrogen and hydrogen are always present in the ratio of 14:3 by mass, whatever the method


or source from which it is obtained.


In water, hydrogen and oxygen are always present in the ratio of 1:8 by mass, whatever the method or source from which water is obtained.


ii) Law of conservation of mass:


According to the law of conservation of mass states, atoms are neither created nor destroyed in a chemical reaction. This means that the total mass of the products formed in a chemical reaction must be equal to the mass of reactants consumed.


For example:



Sum of mass of reactants = Sum of masses of prodcuts


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