Gce Model Questions Vol1 2017 Chemistry Question 15
Practice objective / multiple choice question 15 from the 2017 Gce Model Questions Vol1 Chemistry examination.
The phase diagram of substance X shows that at a pressure of 1 atm the boiling point is 350 K. At this point the slope of the liquid-vapour equilibrium line is \(dP/dT = 0.12\ \text{atm K}^{-1}\). Using the Clapeyron approximation \(\Delta H_{vap} = \Delta V\, dP/dT\, T\) and assuming the molar volume of the liquid is negligible compared with that of the vapour (ideal‑gas behaviour), calculate the molar enthalpy of vaporisation \(\Delta H_{vap}\) in kJ mol⁻¹.
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About This Question
This is Gce Model Questions Vol1 2017 Chemistry Question 15. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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