Question
In: Chemistry
Write a reaction for the dissolution of fluorite (CaF2) in water. Calculate the change in enthalpy,...
Write a reaction for the dissolution of fluorite (CaF2) in water. Calculate the change in enthalpy, entropy and free energy for this reaction at 25°C
Solutions
Expert Solution
Dissolution of CaF2 is
CaF2(s) + H2O(l) ------------------- CaF2(aq)
Chnage in enthalpy = 
H= Hf
of CaF2(aq) - [Hf of CaF2(s) +
Hf of H2O]
=-1184.07 -[-1219.64 -285.83]
H= 321.4 KJ
Change in entropy =S= Sf
of CaF2(aq) - [ Sf of CaF2(s) +
Sf of H2O]
= 92.59 -[68.87+69.91]
S = -46.19J
G = H -
T S
T= 25C = 25+273 = 298K
G = 321.4KJ -
[298x(-46.19J)]
G = 335.164KJ
G = 335.16KJ.
queen_honey_blossom answered 2 years agoRelated Solutions
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