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QPage 46: Q19: HC Verma: Concepts of Physics - Volume 2 Calorimetry Page 46: Q19 Solution: The ratio of specific heat capacity to molar heat capacity of a …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume the ratio is dimensionless or constant because both are heat capacities, but specific heat ($c$) is per unit mass while molar heat ($C$) is per mole. The ratio $c/C$ equals $1/M$ (inverse molecular weight), so it is not dimensionless and varies with the substance's molar mass.

The ratio of specific heat capacity to molar heat capacity of a body ____________.

Multiple Choice Options

  • A is a universal constant
  • B depends on the mass of the body
  • C depends on the molecular weight of the body
  • D is dimensionless

Step-by-Step Verified Solution

**Answer:** (c) depends on the molecular weight of the body. **Step-by-Step Explanation:** Ratio of specific heat capacity (per unit mass) to molar heat capacity (per mole) = 1/M, where M is the molecular weight.

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