passwella.
Menu

JAMB Chemistry 2001 Question 34

Question 34

Energy Changes

NH3(g) + HCl(g) → NH4Cl(s)
The entropy change in the system above is

  1. A.negative
  2. B.indeterminate
  3. C.positive
  4. D.zero
Show the answer and explanation

Answer: A (negative)

Explanation

Two gases combine to form a solid, so the particles become far more ordered and the entropy falls (ΔS is negative).