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Class 11ChemistrySome Basic Concepts of ChemistryLaws of chemical combinationEasy
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In a closed system 31 grams and 9 grams of substances react completely. What will be the total product mass?

Answer and explanation

Correct answer: 40 grams

According to the law of conservation of mass, in a closed system the total mass of reactants before a reaction equals the total mass of products after the reaction. Therefore, total product mass = 31 g + 9 g = 40 g. Values such as 31 g or 9 g represent the mass of only one reactant, not the total products. Exam tip: for a closed-system question, add the masses of all reactants.

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ChemistryLaws Of Chemical CombinationConservation Of MassClosed SystemClass 11Some Basic Concepts Of ChemistryClass 11 Mcq
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10 more MCQs
  1. 1Who is commonly credited with formulating the law of conservation of mass?
  2. 2Which statement correctly describes the law of conservation of mass for a chemical reaction in a closed system?
  3. 3In which type of system can the total mass of a reacting sample be measured as remaining constant without accounting for matter exchanged with the surroundings?
  4. 4Who proposed the law of definite proportions, also known as the law of constant composition?
  5. 5What does the law of definite proportions state about a pure compound?
  6. 6In a pure sample of water, what happens to the mass ratio of hydrogen to oxygen?
  7. 7The law of multiple proportions is associated with which scientist?
  8. 8When does the law of multiple proportions apply?
  9. 9According to the law of multiple proportions, what is the ratio of the masses of one element that combine with a fixed mass of another element in different compounds?
  10. 10Who proposed the law of reciprocal proportions?
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