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A student says mass disappears when gas forms. What is the correct correction?

Answer and explanation

Correct answer: Gas also has mass

A gas is matter: it occupies space and has mass. If a gas escapes from an open container, the measured mass of the container may appear to decrease, but the total mass of the complete closed system, including the gas, is conserved. Option C wrongly treats this open-system observation as destruction of mass. Exam tip: in questions involving gases, check whether the system is open or closed.

Related tags

ChemistryClass 11Mass ConservationChemical CombinationGasesClosed SystemLaws Of Chemical CombinationSome Basic Concepts Of Chemistry

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