Gce Model Questions Vol1 2024 Chemistry Question 27

Practice objective / multiple choice question 27 from the 2024 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2024 Chemistry Objective / Multiple Choice Medium Difficulty
Question 27 GCE_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • objective

At 298 K the vapour pressure of a liquid is \(0.030\ \text{atm}\); at 350 K it is \(0.150\ \text{atm}\). (a) Using the Clausius-Clapeyron equation, determine the molar enthalpy of vapourisation \(\Delta H_{\text{vap}}\) in kJ mol\(^{-1}\). (b) Estimate the boiling point of the liquid when the external pressure is reduced to \(0.50\ \text{atm}\). Assume the enthalpy of vapourisation is temperature‑independent over this range.

Answer Options

A. ΔHvap ≈ 31 kJ mol⁻¹; boiling point at 0.50 atm ≈ 140 °C
B. ΔHvap ≈ 27 kJ mol⁻¹; boiling point at 0.50 atm ≈ 115 °C
C. ΔHvap ≈ 22 kJ mol⁻¹; boiling point at 0.50 atm ≈ 115 °C
Correct Answer D. ΔHvap ≈ 27 kJ mol⁻¹; boiling point at 0.50 atm ≈ 129 °C
Correct Answer
D
Correct Option:
ΔHvap ≈ 27 kJ mol⁻¹; boiling point at 0.50 atm ≈ 129 °C

About This Question

This is Gce Model Questions Vol1 2024 Chemistry Question 27. It is one of the objective questions from the 2024 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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