Iron metal will react with oxygen gas to form a variety of iron oxides. This oxidation reaction is typically referred to as the iron “rusting”. The fact that this reaction is spontaneous at room temperature tells you that
1. iron oxides have a negative Gibbs energy of formation
2. iron oxides have a positive enthalpy of formation
3. iron oxides have a higher standard entropy compared to oxygen and iron
4. the 2nd law of thermodynamics has been violated
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