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JAMB Chemistry 1999 Question 30

Question 30

Energy Changes

RS(aq) + HF(aq) → RF(s) + HS(aq) ΔH = −65.7 kJ mol−1. From the equation above, it can be deduced that

  1. A.the heat content of the reactants is lower than that of the products
  2. B.the heat content of the reactants is higher than that of the products
  3. C.the reaction is slow
  4. D.a large amount of heat is absorbed.
Show the answer and explanation

Answer: B (the heat content of the reactants is higher than that of the products)

Explanation

A negative ΔH means the reaction is exothermic: the reactants had more heat content than the products, and the difference is given out.