For Questions That Don't Merit Their Own Thread

FeO has a bond dissociation energy of 409 kJ/mol, and a molecular mass of 72, which means 13.9 mol/kg, so to split 1kg you'd need just shy of 5.7MJ of energy (assuming 100% efficiency, which naturally you wouldn't get)

Rust is not magnetic.For Questions That Don't Merit Their Own Thread

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