Question

what is law of conservation of mass

Answer 1

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The law of conservation of mass states that mass is an isolated system is neither created nor destroyed by chemical and physical transformation.
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Answer 2

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✴Law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction.

✴For example first of all we take a solution of Lead Nitrate in water then take its weight. Let it's its weight be x gram.

✴After that we take some sodium chloride solution and weight it, let it be y gram.

✴Then add this solution to the lead nitrate, we will find that a white precipitate is formed.

✴Then we take weight of total solution, we will find that the total weight of the contents is (x + y) gram equal to the total weight of the two solution taken.

✴Hence, it can be said that mass is neither created nor destroyed even during a chemical change only care to be taken is that no material is allowed to escape during the reaction.