QQuestion
Which of the following occupies 22.4 L at STP? (1) 32 g of O₂ (2) 2 mol of H₂ (3) 6.022 × 10²³ molecules of NH₃
(a) 1 and 2
(b) 1 and 3
(c) 2 and 3
(d) 1, 2 and 3
ICSEClass 10ChemistryMole Concept and Stoichiometry01 Mark2024 Easy
✓Answer
(b) 1 and 3
Explanation:
(1) The molar mass of O2 = 2 × atomic mass of oxygen ≈ 32 g/mol.
So, 32 grams of O2 is equivalent to 1 mole of O2. 1 mole of any gas at S.T.P. occupies 22.4 liters.
(2) 2 moles of hydrogen gas will occupy 2 x 22.4 = 44.8 litres
(3) 1 mole of NH3 contains 6.022 × 1023 molecules and occupies 22.4 liters at S.T.P. Therefore, 6.022 × 1023 molecules of NH3 will also occupy 22.4 liters at S.T.P.
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