Which of the following processes has a ΔSsys > 0?

Question

Which of the following processes has a ΔS_sys > 0?

CH4(g) + H2O(g) → CO(g) + 3 H2(g)

Rb2CO3(s) + H2O(g) + CO2(g) → 2 RbHCO3(s)

N2(g) + 3 H2(g) → 2 NH3(g)

H2S(l) → H2S(s)

All of the above processes have a ΔS > 0.

Answer 1

CH₄(g) + H₂O(g) → CO(g) + 3 H₂(g)

This reaction is the only one that has ∆S > 0 because it shows 2 moles of gas on the reactant side going to 4 moles of gas on the product side. This represents an increase in entropy. All the other reactions shown have negative entropy.