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In an open container, the measured mass after a reaction is lower because a gas produced escapes. Which conclusion is correct?

Answer and explanation

Correct answer: The mass of the escaped gas was not included in the final measurement

In an open container, a gas produced during the reaction may escape, so the measured mass of the material remaining in the container appears lower. This does not mean that mass was destroyed; when the escaped gas is included, the total mass of the system is conserved. Unlike option A, the gas mass was simply excluded from the final measurement.

Related tags

Chemical ReactionsConservation Of MassOpen ContainerGas EvolutionClass 10 Science

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