Neco Model Questions Vol1 2019 Chemistry Question 9
Practice objective / multiple choice question 9 from the 2019 Neco Model Questions Vol1 Chemistry examination.
For a certain substance the liquid‑vapour equilibrium pressures are measured as follows:\n\n\[\begin{array}{c|c}\text{Temperature (K)} & \text{Pressure (atm)}\\ \hline 350 & 0.80\\ 370 & 1.20\end{array}\]\n\nAssuming the vapour behaves as an ideal gas, use the Clausius-Clapeyron equation \n\[\ln\!\left(\frac{P_2}{P_1}\right)= -\frac{\Delta H_{\text{vap}}}{R}\left(\frac{1}{T_2}-\frac{1}{T_1}\right)\]\n\nto calculate the enthalpy of vaporisation \(\Delta H_{\text{vap}}\) in kJ mol\(^{-1}\). (Take \(R = 8.314\) J mol\(^{-1}\) K\(^{-1}\).)
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This is Neco Model Questions Vol1 2019 Chemistry Question 9. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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