Question

explain the law of conservation of mass

Answer 1

The law of conservation of mass states that mass can neither be created nor be destroyed in a chemical reaction.
For example if you react X grams of reactance then the mass of the final product will also be X grams.
If 12 grams of carbon react with 32 grams of oxygen then the mass of carbon dioxide will always be 44 grams. it can never be more or less than 44 grams.
This is what law of conservation of mass is all about.

Answer 2

$\huge{HEY!!}$
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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.