Question

Using the following data, Compound Melting Point (C) delta H fusion (kJ/mol) Boiling Point (C) delta...

Using the following data,

Compound Melting Point (C) delta H fusion (kJ/mol) Boiling Point (C) delta H vap (kJ/mol)
HF -83.11 4.577 19.54 25.18
HCl -114.3 1.991 -84.9 17.53
HBr -86.96 2.406 -67.0 19.27
Hl -50.91 2.871 -35.38 21.16

calculate ?Sfus and ?Svap for HF.

Determine the entropy change when 3.30 mol of HF(g) condenses at atmospheric pressure.

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Answer #1

For HF

dSfus = dHfus/Tm

          = 4.577 kJ/mol/(273 - 83.11) K

          = 24.103 J/K.mol

dSvap = dHvap/Tb

          = 25.18 kJ/mol/(273 + 19.54) K

          = 86.074 J/K.mol

For HF(g) condensation,

entropy change = 3.30 mol x -86.074 J/K.mol

                          = -284.044 J/K

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