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Class 11ChemistrySome Basic Concepts of ChemistryLaws of chemical combinationEasy
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In a closed vessel total reactants are 72 grams. If one product is 33 grams what is the other product?

Answer and explanation

Correct answer: 39 grams

According to the law of conservation of mass, in a closed vessel the total mass of reactants equals the total mass of products. Therefore, the mass of the second product is 72 - 33 = 39 grams. Here, 33 grams is the mass of one product, while 72 grams is the combined mass of both products. Exam tip: subtract the known product mass from the total mass.

Related tags

ChemistryLaw Of Conservation Of MassChemical CombinationClosed VesselMass CalculationClass 11Laws Of Chemical CombinationSome Basic Concepts Of Chemistry
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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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