For the reaction
2 C(s) + 2 H2(g) → C2H4(g)
∆H°r = +52.3 kJ · mol−1 and ∆S°r =−53.07 J · K−1· mol−1 at 298 K. This reaction will be spontaneous at
1. no temperature.
2. temperatures below 985 K.
3. temperatures above 985 K.
4. temperatures below 1015 K.
5. all temperatures.
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