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During a reaction in an open container, if a produced gas escapes, why can the measured mass of the container and its remaining contents appear to decrease?

Answer and explanation

Correct answer: The escaped gas is no longer part of the container and contents being weighed.

The law of conservation of mass applies to the complete system. In an open container, a produced gas may escape, so it is not included when the container and its remaining contents are weighed later. Therefore, the measured mass appears lower, but total mass has not been destroyed. Option B is incorrect because mass is not destroyed in a chemical reaction.

Related tags

ScienceClass 10Chemical ReactionsConservation Of MassOpen ContainerGas Evolution

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