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Question:

The reaction, MgO(s) + C(s) → Mg(s) + CO(g), for which ΔrH° = +491.1 kJ/mol and ΔrS° = 198.0 J/K/mol is not feasible at 298 K. Temperature above which reaction will be feasible is:

2480.3 K

2040.5 K

1890.0 K

2380.5 K

Solution:

At equilibrium, Teq = ΔH/ΔS = (491.1 × 1000) / 198 = 2480.3 K