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In a closed container, the total mass of the reactants is 50 g. Until the reaction is complete, no matter leaves the container and no matter enters it. What will be the total mass of the products?

Answer and explanation

Correct answer: 50 g

According to the law of conservation of mass, total mass is neither created nor destroyed in a chemical reaction. Since the container is closed, no matter leaves or enters it; therefore, the total mass of the products equals the total mass of the reactants, which is 50 g. A value such as 25 g or 0 g would imply that mass has disappeared, which is not possible in this situation.

Related tags

ScienceClass 10Chemical ReactionsConservation Of MassClosed System

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