Multiple choice

Consider the following equilibrium SO2 (g) + ½ O2 (g) ⇌ SO3 (g), $\Delta$H = –23.5 kCal mo1–1 The formation of SO3 is favoured by

  1. compression and decreasing the temperature

  2. compression and increasing the temperature

  3. expansion and increasing the temperature

  4. expansion and decreasing the temperature
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A Correct answer
Explanation

The reaction is exothermic (delta H < 0) and involves a decrease in moles of gas (1.5 moles to 1 mole). According to Le Chatelier's principle, decreasing temperature favors the exothermic direction, and increasing pressure (compression) favors the side with fewer moles of gas.

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