Consider the data in the table.
Compound
Melting point (°C)
ΔHfus (kJ/mol)ΔHfus (kJ/mol)
Boiling point (°C)
ΔHvap (kJ/mol)ΔHvap (kJ/mol)
HFHF
−83.11
4.577
19.54
25.18
HClHCl
−114.3
1.991
−84.9
17.53
HBrHBr
−86.96
2.406
−67.0
19.27
HIHI
−50.91
2.871
−35.38
21.16
Using the data in the table,
calculate ΔSfusΔSfus and ΔSvapΔSvap for HF.HF.
ΔSfus=ΔSfus=
J/(K⋅mol)J/(K⋅mol)
ΔSvap=ΔSvap=
J/(K⋅mol)J/(K⋅mol)
Determine the entropy change
when 3.90 mol HF(l)3.90 mol HF(l) freezes
at atmospheric pressure.
ΔS=ΔS=
J/K