[Olympiad] For a specific reaction, ΔH = -100 kJ/mol and ΔS = -200 J/mol·K. Below what temperature (in Kelvin) will the reaction be spontaneous?

  1. 200 K
  2. 400 K
  3. 500 K
  4. 1000 K

📝 Detailed explanation

Spontaneity requires ΔG < 0. ΔG = ΔH - TΔS.
-100,000 - T(-200) < 0
-100,000 + 200T < 0
200T < 100,000
T < 500 K.
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