Neco 2018 Chemistry Question 19

Practice objective / multiple choice question 19 from the 2018 Neco Chemistry examination.

Neco 2018 Chemistry Objective / Multiple Choice Medium Difficulty

Question 19 NECO • 2018 • CHEMISTRY • objective

Substance X has a triple point at (0.5 MPa, 250 K) and a critical point at (4.5 MPa, 560 K). At a pressure of 1.0 MPa it melts at 300 K and boils at 420 K. Two moles of X are initially in the liquid state at 280 K and 1.0 MPa. The system is heated at constant pressure to 500 K. Assuming the molar volumes of liquid and solid are negligible (0.001 L·mol⁻¹) and that of the vapour is 24.5 L·mol⁻¹ at 420 K, and neglecting volume change during melting, calculate the total work done by the system (in kJ).

Correct Answer A. 5.83×10^{1} kJ

B. 6.20×10^{1} kJ

C. 5.83×10^{2} kJ

D. 4.75×10^{1} kJ

Correct Answer

Correct Option:

5.83×10^{1} kJ

This is Neco 2018 Chemistry Question 19. It is one of the objective questions from the 2018 Neco Chemistry examination.

Difficulty level: Medium .

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