Question

Which postulate of Dalton’s atomic theory can explain the law of definite proportions?
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Answer 1

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The postulate of Dalton’s atomic theory that can explain the law of definite proportions is – the

relative number and kinds of atoms are equal in given compounds

Answer 2

$\to$Law of definite proportion states that "the elements are always present in definite proportions by mass."

$\to$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."