For which of the following would ∆S most likely have a value very close to zero?
1. 2 H2O(ℓ) → 2 H2(g) + O2(g)
2. CO2(g) → CO2(s)
3. KOH(s) + NH4Cl(s) →
NH3(g) + H2O(ℓ) + KCl(aq)
4. CH4(g) + 2 O2(g) →
CO2(g) + 2 H2O(ℓ)
5. CO(g) + NO2(g) →
CO2(g) + NO(g)