The value of (Cp - Cv) for a real gas obeying Vander Wall's equation is____________________?
Correct answer: B. > R
- A. R
- B. > R
- C. < R
- D. 0.5 R
Explanation
For a van der Waals gas, the attractive-force term makes the denominator in the real-gas expression for Cp − Cv less than one, so Cp − Cv is greater than R under stable conditions. The ideal-gas result Cp − Cv = R is therefore not exact for this gas.
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