Lesson eLearning

According to Avogadro's hypothesis, how many liters of a gas will occupy 3 moles at standard temperature and pressure (STP)?

medium 2 marks Class 9 · Science · Atoms and Molecules
Answer
67.2 L

The correct answer is 67.2 L — Multiply the volume per mole by the number of moles: - (22.4\,\text{L} \times 3 = 67.2\,\text{L}\).

Step-by-step solution

  1. At STP, 1 mole of any ideal gas occupies 22.4 L.
  2. Multiply the volume per mole by the number of moles: - (22.4\,\text{L} \times 3 = 67.2\,\text{L}\).
Common mistake: Using the wrong STP volume (e.g., 22 L) or mis‑multiplying

Concept tested: Avogadro's hypothesis

Published · How this solution was prepared and checked

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