Compare the compounds in each set below and decide which is expected to have the higher entropy. Assume all are at the same temperature. Check your answers using data in Appendix L.
(a) HF(g), HCl(g), or HBr(g)
(b) NH₄Cl(s) or NH₄Cl(aq)
(c) C₂H₄(g) or N₂(g) (two substances with the same molar mass)
(d) NaCl(s) or NaCl(g)

Data given in Appendix L

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TABLE 20 Species Aluminum Al(s) AICI 3(S) Al2O3(S) Barium BaCl₂(s) BaCO3(s) BaO(s) BaSO4(s) Beryllium Be(s) Be(OH)2(S) Boron BC13(g) Bromine Br(g) Br₂(e) Br₂(g) BrF3(g) HBr(g) Selected Thermodynamic A+H° (298.15 K) (kJ/mol) -705.63 - 1675.7 -858.6 - 1213 -548.1 -1473.2 0 -902.5 -402.96 111.884 0 30.91 -255.60 -36.29 Values* Sº (298.15 K) (J/K . mol) 28.3 109.29 50.92 123.68 112.1 72.05 132.2 9.5 51.9 290.17 175.022 152.2 245.47 292.53 198.70 AFGᵒ (298.15 K) (kJ/mol) -630.0 - 1582.3 -810.4 -1134.41 -520.38 - 1362.2 0 -815.0 -387.95 82.396 0 3.12 -229.43 -53.45