Except for monatomic gases, the molal heat capacity at constant volume for all gases is _____________ Kcal/Kg mole.° K?
Correct answer: C. > 3
- A. 3
- B. < 3
- C. > 3
- D. < 1
Explanation
A monatomic ideal gas has only three translational degrees of freedom, giving Cv = 3 cal per g-mol·K approximately. Polyatomic gases also possess rotational and sometimes vibrational modes, so their molal Cv is greater than 3.
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