Given the following four chemical reactions that occur at constant T = 298 K and P = 1 bar: 1. 4 Fe(s) + 3 O2(g) ??-> 2 Fe2O3(s) 2. O(g) + O(g) ??-> O2(g) 3. NH4Cl(s) ??-> NH3(g) + HCl(g) 4. N2(g) + O2(g) ??-> 2 NO(g) (a) Predict whether the entropy change is positive, negative, or impossible to determine from the available information for each of the four reactions above. Explain your answers. (No calculations are allowed! Use your chemical intuition).