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Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Hydrolysis of carbon disulfide
           +       2       +         2
Carbon disulfide
 +
Steam
  
Reactants
  
Carbon dioxide
 +
Hydrogen sulfide
 
Products
  
Products – Reactants
ΔfH⦵
  
ΔfH⦵
 
Σf-reactH⦵
  
ΔfH⦵
  
ΔfH
 
 
Σf-prodH⦵
  
Σf-prodH⦵ - Σf-reactH⦵ = ΔrH⦵
(89.7 x 1)
+
(-241.8 x 2)
=
-393.94
 
(-393.5 x 1)
+
(-20.6 x 2)
=
-434.8
 
-434.8 - -393.9 = -40.8 kJmol-1
                             
S⦵
  
S⦵
 
ΣreactS⦵
  
S⦵
  
S
 
 
ΣprodS⦵
  
ΣprodS⦵ - ΣreactS⦵ = ΔrS⦵
(0.151 x 1)
+
(0.189 x 2)
=
0.529
 
(0.214 x 1)
+
(0.206 x 2)
=
0.625
 
0.625 - 0.529 = 0.096 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
  
ΔrG⦵   = ΔrH⦵ – (T298 x ΔrS⦵)   =   -40.8– (298 x 0.096)  =
-69.5kJmol-1
ΔrH⦵
=
 -40.8 kJmol-1 Negative value: the reaction is exothermic
ΔrS⦵
=
 +0.096 kJK-1mol-1 Positive value: the system becomes more dispersed
ΔrG⦵ 298K
=
 -69.5 kJmol-1 Negative value: the reaction is feasible (spontaneous)
Keq 298K
=
 1.54 x 1012 Value is greater than 1: the reaction proceeds to the right
No equilibrium temperature: this reaction is feasible at all temperatures
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List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –

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