Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ?
Correct answer: B. d ln p/dt = Hvap/RT2
- A. d ln p/dt = RT2/Hvap
- B. d ln p/dt = Hvap/RT2
- C. dp/dt = RT2/Hvap
- D. dp/dt = Hvap/RT2
Explanation
With liquid molar volume negligible and the vapour treated as ideal, the Clausius-Clapeyron equation becomes d ln p/dT = Hvap/(R T²). The other forms either invert the relation or incorrectly use dp instead of d ln p.
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