1.
SS^\circ (J K1^{-1} mol1^{-1}): H2=130.6\text{H}_2 = 130.6, Cl2=223.0\text{Cl}_2 = 223.0, HCl=186.7\text{HCl} = 186.7. For H2+Cl22HCl\text{H}_2 + \text{Cl}_2 \rightarrow 2\text{HCl}, ΔS\Delta S^\circ is: