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If gas escapes during a reaction, what care is needed while checking conservation of mass?

Answer and explanation

Correct answer: Use a closed vessel

The governing concept is the law of conservation of mass: in a chemical reaction, matter is neither created nor destroyed, although it may change form. If a gas escapes from an open container, the balance measures only the material left inside, so the observed mass may decrease even though the total mass of the reacting system has remained constant. A closed vessel keeps the gaseous products within the measured system. Therefore, option B is correct. An open vessel allows matter to leave, while stopping temperature measurement or observing colour does not prevent mass loss and cannot test conservation quantitatively. The comparison should also be made using the total mass before and after reaction, with the same sealed apparatus.

Related tags

ChemistryLaws Of Chemical CombinationConservation Of MassSome Basic Concepts Of ChemistryClass 11 Mcq

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