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Question

Which postulate of Dalton's atomic theory can explain law of definite proportions?

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Solution

Law of definite proportion states that "the elements are always present in definite proportions by mass."
And we know that the last postulate of Dalton's atomic theory which states that, "In a given compound, the relative number and types of atoms are constant."
This postulate can explain the law of definite proportions.

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