Neco 2024 Chemistry Question 9

Practice objective / multiple choice question 9 from the 2024 Neco Chemistry examination.

Neco 2024 Chemistry Objective / Multiple Choice Medium Difficulty

Question 9 NECO • 2024 • CHEMISTRY • objective

The vapor pressure of a volatile liquid at two temperatures is measured as follows: at 298 K the pressure is 0.40 atm, and at 308 K the pressure is 0.80 atm. Assuming the Clausius-Clapeyron relation \(\ln(P_2/P_1) = -\Delta H_{vap}/R\,(1/T_2 - 1/T_1)\) with \(R = 8.314\) J mol^{-1}\,K^{-1}, calculate the enthalpy of vapourisation \(\Delta H_{vap}\) in kJ mol^{-1}. Give your answer to two significant figures.

Correct Answer A. 53 kJ/mol

B. 45 kJ/mol

C. 62 kJ/mol

D. 78 kJ/mol

Correct Answer

Correct Option:

53 kJ/mol

This is Neco 2024 Chemistry Question 9. It is one of the objective questions from the 2024 Neco Chemistry examination.

Difficulty level: Medium .

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