3. A researcher placed 25.0 g of silver chloride, AgCl, in sunlight and allowed

Question

3. A researcher placed 25.0 g of silver chloride, AgCl, in sunlight and allowed the substance to decompose completely to form silver, Ag, with the release of chlorine gas, Cl2. The gas was collected in a container during the decomposition. The researcher determined that the mass of the silver formed was 18.8 g, and the mass of the chlorine gas formed was 6.2 g. The equation for the reaction is:

a. State the law of definite proportions. Then use the researcher's data to confirm the law of definite proportions. Show your calculations.

b. State the law of conservation of matter. Then use the researcher's data to confirm the conservation of matter. Show your calculations.

Explanation / Answer

Ans 3 :

a) According to the law of definite proportions , a compound contains fixed ratio of elements by mass whatever be its source.

In AgCl , one atom of each element is present , so the ratio is : 107.9 : 35.4 , which is ~ t3 :1 .

The researcher obtained 18.8 g Ag and 6.2 g of Cl , which also has the ratio of 3 : 1 approximately.

This proves the law of constant proportion.

b) According to the law of conservation of matter , the mass of system do not change with respect to time , since it is a closed system.

Here the researcher took 25.0 g of compound , and he then received 18.8 g of silver and 6.2 g of chlorine.

The total amount of the product = 18.8 + 6.2 = 25.0 g

So hence the amount remains constant and law of conservation of matter is confirmed.

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