Verified Solution • 2025–26 Session moderate

QPage 33: Q12: HC Verma: Concepts of Physics - Volume 2 Kinetic Theory of Gases Page 33: Q12 Solution: The quantity represents

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently confuse the ideal gas constant $R$ with the Boltzmann constant $k$, leading them to incorrectly identify the quantity as the number of moles ($n$) instead of the number of molecules ($N$). Remember that $pV = nRT$ uses moles, while $pV = NkT$ uses individual molecules, so dividing by $kT$ specifically isolates $N$.

The quantity pVkT\frac{pV}{kT} represents

Multiple Choice Options

  • A mass of the gas
  • B kinetic energy of the gas
  • C number of moles of the gas
  • D number of molecules in the gas.

Step-by-Step Verified Solution

**Answer:** (d) number of molecules in the gas. **Step-by-Step Explanation:** pV = NkT, where N is the number of molecules. So pV/kT = N.

All Questions in this Chapter

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