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In a closed container a metal reacts with acid and gas forms but does not escape. What is the most suitable conclusion about total mass?

Answer and explanation

Correct answer: Total mass will remain same

The law of conservation of mass states that matter is neither created nor destroyed during a chemical reaction. In a closed container, the hydrogen or other gas produced by the metal–acid reaction remains inside the system, so it is included in the final measurement. Although the substances change into new products, the combined mass of all reactants and products remains constant. Hence option A is correct; an apparent decrease would occur only if gas escaped from an open system.

Related tags

ScienceClass 10Conservation Of MassChemical ReactionClosed SystemChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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