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Class 11ChemistrySome Basic Concepts of ChemistryLaws of chemical combinationEasy
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If a 63 gram compound contains 21 grams A what is mass of B?

Answer and explanation

Correct answer: 42 grams

The total mass of a compound equals the sum of the masses of components A and B. Therefore, mass of B = 63 g − 21 g = 42 g. Here, 21 g is the mass of A only, while 63 g is the mass of the complete compound. Exam tip: To find an unknown component, subtract the known component’s mass from the total mass.

Related tags

ChemistryChemical CombinationMass ConservationCompound CompositionClass 11Laws Of Chemical CombinationSome 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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