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JAMB Chemistry 2010 Question 26

Question 26

Energy Changes

In which of the following is the entropy change positive?

  1. A.Thermal dissociation of ammonium chloride
  2. B.Reaction between an acid and a base
  3. C.Addition of concentrated acid to water
  4. D.Dissolution of sodium metal in water
Show the answer and explanation

Answer: A (Thermal dissociation of ammonium chloride)

Explanation

NH4Cl(s) → NH3(g) + HCl(g): a solid turns into two gases, so disorder increases a lot.