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When can the measured mass of the material left after a reaction be less than the mass of the reactants without violating conservation of mass?

Answer and explanation

Correct answer: When gas escapes from an open vessel and is not weighed

A is correct. In an open vessel, a gaseous product may escape and be left out of the measurement, making the remaining material seem lighter. If the escaped gas is included, total mass is conserved; in a closed system, all reactants and products must be accounted for.

Related tags

ChemistryConservation Of MassOpen SystemsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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