Question

A. Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?

B. State the law of constant proportion. Explain it by taking the example of H2O (water)and CH4(methane)

(1+2=3)

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Answer 1

Answer:

Ans. A. The postulate of Dalton's atomic theory that is the result of the law of conservation of mass is-the relative number and kinds of atoms are constant in a given compound. Atoms cannot be created nor destroyed in a chemical reaction. 4.

B.Law of Multiple proportion states that when two elements combine to form more than one compound, the mass of one element, which combines with a fixed mass of the other element, will always be ratios of whole numbers.

For example, let us assume 2 molecules CO (carbon monoxide) and CO

2

(carbon dioxide).

CO= 12gm of carbon + 16 grams of Oxygen.

CO

2

= 12gm carbon+ 32 grams of Oxygen.

The ratio of the mass of oxygen in the given two compounds is 16:32=1:2.

Thus law of multiple proportions is proved.