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Atoms and Molecules — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
MCQ
Which of the following would weigh the highest?
  • A
    0.2 mole of sucrose (C12 H22 O,,)
  • B
    2 moles of CO2
  • C
    2 moles of CaCO3
  • D
    10 moles of H2O
✓

Answer

  1. 2 moles of CaCO3 would weigh the highest.

Explanation:

  1. Mass of 1 mole of sucrose (12 × 12) + (1 × 22)+ (16 ×11) = 342g
Mass of 0.2 mole of sucrose = 342 × 0.2 = 68.4g
  1. Mass of 1 mole of CO2 = 12 + (16 × 2) = 44g. Mass of 2 moles of CO2 = 44 × 2 = 88g
  2. Mass of 1 mole of CaCO3 = 40 + 12 + (16 × 3) = 100g
Mass of 2 moles of CaCO3 = 100 × 2 = 200g
  1. Mass of 1 mole of H20 = 2 + 16 = 18g
Mass of 10 moles of H2O = 18 × 10 = 180g
Therefore, mass of 2 moles of CaCO3 is the highest, i.e., 200g.

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