Consider the following reaction:
2 Sn(s) + O₂(g) → 2 SnO(s), ΔH = −561.42 kJ/mol (−134.18 kcal/mol)
Is the reaction spontaneous at all temperatures?

• A. Yes, the reaction is spontaneous at all temperatures.
• B. No, the reaction is spontaneous at high temperatures only.
• C. No, the reaction is spontaneous at low temperatures only.
• D. No, the reaction is nonspontaneous at all temperatures.

Answer: (C)