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JAMB Chemistry 2001 Question 28

Question 28

Energy Changes

C(s) + 2S(g) → CS2(g) ΔH = +89 kJ mol−1
The chemical equation above implies that

  1. A.each of carbon and sulphur has 89kJ of energy
  2. B.both carbon and sulphur contribute 89kJ of energy
  3. C.89 kJ of energy is released
  4. D.89 kJ of energy is absorbed
Show the answer and explanation

Answer: D (89 kJ of energy is absorbed)

Explanation

A positive ΔH means the reaction is endothermic: 89 kJ of heat is taken in for every mole of CS2 formed.