ΔS° (in J mol-1 K-1) for the given reaction at 298 K is ________. [Cu(H2O)6]2+ + en ⇌ [Cu(H2O)4(en)]2+ + 2H2O (Given: log K1 = 10.6, where K1 is the equilibrium constant. ΔH° =-54 kJ mol-1 and R = 8.314 J mol-1 K-1) (rounded off to two decimal places)