Which of the following reactions would have a positive value for ΔS°? 1. Ba(OH)2(s) + CO2(g) → BaCO3(s) + H2O(l)
2. H2O(s) → H2O(l) 3. 2 SO3(g) → 2 SO2(g) + O2(g) 4. AgNO3(aq) + HCl(aq) → AgCl(s) + HNO3(aq)
We have 2 aqueous reactants forming 1 solid product and 1 aqueous product. The aqueous phase is technically a liquid, so we’re going from a liquid to a solid in this reaction.