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Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistrySome Basic Concepts of Chemistry1 Mark
MCQ
One mole of oxygen gas at STP is equal to _______.
  • A
    6.022 × 1023 molecules of oxygen.
  • B
    6.022 × 1023 atoms of oxygen.
  • C
    16g of oxygen.
  • D
    32g of oxygen.
✓

Answer

  1. 6.022 × 1023 molecules of oxygen.
  1. 32g of oxygen.

Explanation:

1 mole of O2 gas at STP = 6.022 × 1023 molecules of O2 (Avogadro number) = 32g of O2. Hence, 1 mole of oxygen gas is equal to molecular weight of oxygen as well as Avogadro number.

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