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In a closed vessel, 8 grams of oxygen and 1 gram of hydrogen react. What will be the total mass of the products?

Answer and explanation

Correct answer: 9 grams

This question applies the law of conservation of mass to a closed reaction system. Since the vessel is closed, no reactant or product can escape, so the total mass of all products must equal the total mass of the reactants. Add the given masses: 8 g oxygen + 1 g hydrogen = 9 g. Thus, the total product mass is 9 g and option C is correct. The question asks for total mass, not the mass of oxygen, hydrogen, or a particular product. The chemical identity of the product is not needed for this calculation. Options A and B result from omitting one part of the reactant mass, whereas option D incorrectly adds an extra gram. The closed-vessel condition is essential because it makes the measured system complete.

Related tags

ChemistryConservation Of MassLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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