4. Calculate the standard free energy, AG rxn of the precipitation of lead ion from a Flint water sample as shown: Pb²+ (aq) + 21 (aq) → PbI2(s) AG rxn Compound Pb (ag) 2+ I (aq) PbI2(s) AG°f -24.4 -51.6 -173.6 formation (kJ/mol)

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