Igcse Model Questions Vol1 2025 Chemistry Question 35

Practice objective / multiple choice question 35 from the 2025 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2025 Chemistry Objective / Multiple Choice Medium Difficulty

Question 35 IGCSE_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • objective

A substance has a liquid‑vapor equilibrium line that can be approximated by \(\ln P = -\frac{3500}{T} + 5.0\), where \(P\) is in kPa and \(T\) in K. Using the Clausius‑Clapeyron relation, determine the enthalpy of vapourisation \(\Delta H_{vap}\) in kJ mol⁻¹.

Answer Options

Correct Answer A. 29.1 kJ mol⁻¹

B. 28.0 kJ mol⁻¹

C. 26.5 kJ mol⁻¹

D. 31.5 kJ mol⁻¹

Correct Answer

Correct Option:

29.1 kJ mol⁻¹

About This Question

This is Igcse Model Questions Vol1 2025 Chemistry Question 35. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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Igcse Model Questions Vol1 2025 Chemistry Question 35

A substance has a liquid‑vapor equilibrium line that can be approximated by \(\ln P = -\frac{3500}{T} + 5.0\), where \(P\) is in kPa and \(T\) in K. Using the Clausius‑Clapeyron relation, determine the enthalpy of vapourisation \(\Delta H_{vap}\) in kJ mol⁻¹.

Answer Options

About This Question

Master the Exam!

A substance has a liquid‑vapor equilibrium line that can be approximated by \(\ln P = -\frac{3500}{T} + 5.0\), where \(P\) is in kPa and \(T\) in K. Using the Clausius‑Clapeyron relation, determine the enthalpy of vapourisation \(\Delta H_{vap}\) in kJ mol⁻¹.