How does this experiment illustrate the principle of conservation of matter

Measuring the weights of Products and Reactants

Explanation:

The amount of matter is conserved before and after the completion of the reaction. When matter changes from one form to another it is not destroyed that is the amount remains the same. We can check this by going through a reaction and measuring their masses before and after the completion of the reaction. If the weight is equal, it proves the conservation of mass.