Question

which postulate of daltons atomic theory can explain the law of definite proportions

Answer 1

The relative number and kinds of atoms are constant in a given compound.
I think these is ur ans.

Answer 2

“The relative number and kinds of atom in a given compound remain constant”.  

Explanation:

• The postulate of 'Dalton’s Atomic theory' which can explain the law of definite proportion.

• These postulates explain that atoms of same kinds are present in the same type of molecule like Substance made of up Carbon has the atoms of Carbon.

• Similarly the Copper metal has copper atom and similarly Iron metal has iron atoms in it and these are present in fixed proportions like Hydrogen and Oxygen in$H_2O.$

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