Waec Model Questions Vol1 2019 Chemistry Question 38

Practice objective / multiple choice question 38 from the 2019 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2019 Chemistry Objective / Multiple Choice Medium Difficulty

Question 38 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • objective

Liquid A has a normal boiling point of 78 °C at 1 atm and an enthalpy of vaporisation of 30.3 kJ mol⁻¹. Estimate its boiling point when the external pressure is reduced to 0.5 atm. (Use R = 8.314 J mol⁻¹ K⁻¹ and assume ΔH_vap is constant.)

Answer Options

A. 62 °C

Correct Answer B. 56 °C

C. 68 °C

D. 45 °C

Correct Answer

Correct Option:

56 °C

About This Question

This is Waec Model Questions Vol1 2019 Chemistry Question 38. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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Waec Model Questions Vol1 2019 Chemistry Question 38

Liquid A has a normal boiling point of 78 °C at 1 atm and an enthalpy of vaporisation of 30.3 kJ mol⁻¹. Estimate its boiling point when the external pressure is reduced to 0.5 atm. (Use R = 8.314 J mol⁻¹ K⁻¹ and assume ΔH_vap is constant.)

Answer Options

About This Question

Master the Exam!

Liquid A has a normal boiling point of 78 °C at 1 atm and an enthalpy of vaporisation of 30.3 kJ mol⁻¹. Estimate its boiling point when the external pressure is reduced to 0.5 atm. (Use R = 8.314 J mol⁻¹ K⁻¹ and assume ΔH_vap is constant.)