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Atoms and Molecules — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
MCQ
Formula unit mass of $\mathrm{CaCO}_3$​ is:
  • A
    $104\ u$
  • B
    $106\ u$
  • ✓
    $100\ u$
  • D
    $1144\ u$
✓

Answer

Correct option: C.
$100\ u$

Formula unit mass of $\mathrm{CaCO}_3$​ = Atomic mass of $Ca +$ Atomic mass of $C +$ (Atomic mass of $O \times 3)$
$= 40u + 12u + (16u \times 3)$
$=100u$

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