WAEC Chemistry 2023 Objective — Question 37

Question 37 of 50 from the West African Examinations Council (WAEC) Chemistry 2023 Objective paper, with the correct answer and a full explanation.

Consider the following reaction equation: 2SO3(g) → 2SO2(g) + O2(g); ΔH = +198 kJ mol⁻¹. Which of the following statements about the reaction is correct?

A. The reaction is exothermic
B. The reaction container would feel warm
C. 198 kJ of energy is given off
D. 198 kJ of energy is absorbedCorrect

Explanation

Since ΔH is positive, the reaction is endothermic, not exothermic — heat is absorbed, not released. An endothermic reaction container would feel colder, not warmer.

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