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Atoms and Molecules — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
MCQ
Calculate the formula unit mass (u) of CaCl2​.[ Ca = 40u, Cl = 35.5u]
  • A
    111u
  • B
    101u
  • C
    91u
  • D
    55u
✓

Answer

  1. 111u

Explanation:

Formula unit mass = Atomic mass of Ca + (2 × Atomic mass of Cl) = 40 + (2 × 35.5) = 40 + 71 = 111u

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