Which of the following would probably have a positive ∆S value?
1. O2(g) → O2(aq)
2. He(g, 2 atm) → He(g, 10 atm)
3. 2 NO2(g) → N2O4(g)
4. 2 Ag(s) + Br2(l) → 2 AgBr(s)
5. H2(g) + I2(s) → 2 HI(g)
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