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Class 11ChemistrySome Basic Concepts of ChemistryLaws of chemical combinationEasy
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If 14 grams reactant gives 10 grams product and 4 grams gas what should be measured total product mass?

Answer and explanation

Correct answer: 14 grams

According to the law of conservation of mass, the total mass remains constant in a chemical reaction. Here, the 4 g gas is also a product, so total product mass = 10 + 4 = 14 g. The 10 g value is only the mass of the main product, not of all products. Exam tip: always include the mass of a gas when calculating total product mass.

Related tags

Law Of Conservation Of MassChemical ReactionsProduct MassReactant MassClass 11 ChemistryLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistry
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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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