Substance He H2 N2 O2 Cl2 Br Hg Ag Na CO2 H20 NH3 H2S CHA C2H6 6h16 CH3OH Fusion

Question

Substance He H2 N2 O2 Cl2 Br Hg Ag Na CO2 H20 NH3 H2S CHA C2H6 6h16 CH3OH Fusion Ah. (K) (kJ mol 0.021 3.5 83.81 1.188 13.96 0.719 63.15 0.444 54.36 172.1 6.41 265.9 10.57 386.8 15.52 234.3 2.292 11.30 1234 371.0 2.601 217.0 8.33 273.15 6.008 5.652 195.4 187.6 2.377 0.941 90.68 89.85 2.86 278.61 10.59 175.2 3.16 Evaporation Tb 4h. vap (kJ mol-l (K) 4.22 0.084 87.29 6.506 0.916 20.38 77.35 5.586 90.18 6.820 239.1 20.41 332.4 29.45 458.4 41.80 629.7 59.30 2436 250.6 98.01. 1156 194.6 25.23 40.656 373.15 23.35 239.7 212.8 18.67 8.18 184.6 14.7 353.2 30.8 337.2 35.27

Explanation / Answer

Given molar enthalpy of vaporization and the boiling point, we can use the relation

Svap = Hvap/Tb

Plug in values and obtain

Svap (Ar) = (6.506 kJ/mol)/87.29 K = (6.506 kJ/mol)*(1000 J/1 kJ)/(87.29 K) = 74.533 J/mol.K (ans).

Svap (Na) = (98.01 kJ/mol)/(1156 K) = (98.01 kJ/mol)*(1000 J/1 kJ)/(1156 K) = 84.784 J/mol.K (ans)

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