Which postulate of dalton atomic theory can explain the law of definite proportions?

Question

Answer

Daltons postulate ' atoms of different element combine in fixed proportions to form compounds ' justify the law of constant proportions.?

Answer

It can be explained as follows
The no.and kind of atoms in a given compound is fixed ...
For ex . If we take the example of H²0 ..then when it is decomposed always 11 grams of hydrogen and 89 grams of water are left....If we take sea ..river ...well water ..so water will always consists of the same amount

Answer

Dalton postulate was that the the molecules combine in a small whole number by mass to form a compound.  ..  .as if ....water combined in 1:8 then.  ..at a time it donot combine in 1:9....this is ..

Answer

Postulate of Dalton's Atomic Theory:
The postulate of Dalton's Atomic Theory that can explain the law of definite proportions is the postulate of fixed ratios.

Explanation:
The law of definite proportions states that a chemical compound always contains the same elements in the same definite proportions by mass. This means that the ratio of the masses of the elements in a compound is always constant, regardless of the amount of the compound.

Postulate of Fixed Ratios:
According to Dalton's Atomic Theory, elements are composed of tiny, indivisible particles called atoms. The postulate of fixed ratios states that atoms combine with each other in simple, whole number ratios to form compounds. This means that the ratio of the number of atoms of each element in a compound is always constant.

Example:
Let's take the compound water (H2O) as an example. The law of definite proportions states that the ratio of hydrogen to oxygen in water is always 2:1 by mass. This means that for every 2 grams of hydrogen, there will always be 16 grams of oxygen in water.

Explanation using Postulate:
According to the postulate of fixed ratios, the atoms of hydrogen and oxygen combine in a specific ratio to form water. In this case, two hydrogen atoms combine with one oxygen atom. Since the atomic mass of hydrogen is approximately 1 gram/mole and the atomic mass of oxygen is approximately 16 grams/mole, the ratio of their masses in water will always be 2:16, which simplifies to 1:8.

Conclusion:
The postulate of fixed ratios in Dalton's Atomic Theory explains the law of definite proportions by stating that atoms combine in specific ratios to form compounds. In the case of water, the ratio of hydrogen to oxygen is always 2:1 by mass, demonstrating the constant and fixed ratios of elements in compounds. This postulate provides a fundamental understanding of the composition of compounds and supports the experimental observations of the law of definite proportions.

Answer

Atoms combine in the ratio of small whole numbers to form a compound .In a compound the relative number and the kinds of atom are constant

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