Problem: 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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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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Based on our data, we think this problem is relevant for Professor Lee's class at PIMA.