The standard entropy change for the dissolution of caf2 in water at 298 K is 56.11 kJ.
Entropy is the total amount of energy that is not available to do a work.
The reaction is
CaF₂(s) → CaF₂(aq)
S° of CaF₂(s) = 68.87 J/K•mol
S° of CaF₂(aq) = –80.8 J/K•mol
ΔH°f of CaF₂(s) = –1219.6 kJ/mol
ΔH°f of CaF₂(aq) = –1208.09 kJ/mol
(– 80.8 ) – ( 68.87 )
= –149.67 J/K
(–1208.09) – (–1219.6) = 11.51 kJ
(11. 51 J) – (298 K) (–149.67 J/K) = 56112 J
= 56.11 kJ
Thus, the standard entropy change for the dissolution of caf2 in water at 298 K is 56.11 kJ
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