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Mole concept and Stoichiometry — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryMole concept and Stoichiometry1 Mark
MCQ
Avogadro number is:
  • A
    Number of atoms in one gram of element
  • B
    Number of milliliters which one mole of a gaseous substances occupies at NTP
  • C
    Number of molecules present in one gram molecular mass of a substance
  • D
    All of the above
✓

Answer

C. Number of molecules present in one gram molecular mass of a substance
Explanation: The number of entities present in 1 mol (gram molecular mass) of any substance is represented as Avogadro's constant or Avogadro's number denoted by NA. One mole contains exactly 6.02214076 × 1023 elementary entities.

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