For the reaction
2 SO3(g) → 2 SO2(g) + O2(g)
∆H◦r = +198 kJ · mol−1 and ∆S◦r = 190 J · K−1 · mol−1 at 298 K. The forward reaction will be spontaneous at
1. temperatures above 1042 K.
2. temperatures below 1042 K.
3. all temperatures.
4. no temperature.
5. temperatures above 1315 K.
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