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In a closed container, a total of 20 g of reactants undergo a reaction to form products, and any gas produced remains inside the container. What will be the total mass of the products?

Answer and explanation

Correct answer: 20 g

According to the law of conservation of mass, mass is neither created nor destroyed during a reaction in a closed container. Since no gas or other substance leaves the container, the total mass of the products equals the total mass of the reactants, which is 20 g. A value such as 10 g would be possible only if some material escaped from the container.

Related tags

ScienceClass 10Chemical ReactionsConservation Of MassClosed Container

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