Question

Define law of conservation of mass

Answer 1

According to law of conservation of mass in any physical or chemical change the total mass of the reactant is always equal to the total mass of the products

For example in reaction below :-
C + O2 gives CO2
Here, the mass of product and reactant is same i.e., 44

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.