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List Thermochemical Reactions Build-a-Reaction Synthlet

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Carbon plus water shift reaction
           +             +        
Carbon
+
Steam
 
Reactants
 
Carbon monoxide
+
Hydrogen
 
Products
 
Products – Reactants
Δf H ⦵
 
ΔfH⦵
 
Σf-react H ⦵
 
Δf H ⦵
 
ΔfH
 
 
Σf-prod H ⦵
 
Σf-prod H ⦵ - Σf-react H ⦵ = Δr H ⦵
(0.0 x 1)
+
(-241.8 x 1)
=
-241.82
 
(-110.5 x 1)
+
(0.0 x 1)
=
-110.5
 
-110.5 - -241.8 = 131.3 kJmol-1
                             
S ⦵
 
S⦵
 
Σreact S ⦵
 
S ⦵
 
S
 
 
Σprod S ⦵
 
Σprod S ⦵ - Σreact S ⦵ = Δr S ⦵
(0.006 x 1)
+
(0.189 x 1)
=
0.195
 
(0.198 x 1)
+
(0.131 x 1)
=
0.328
 
0.328 - 0.195 = 0.134 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
Δr G ⦵   = Δr H ⦵ – (T 298 x Δr S ⦵)   =   131.3– (298 x0.134)  =
+91.4kJmol-1
Δr H ⦵
=
 +131.3 kJmol-1 Positive value: the reaction is endothermic
Δr S ⦵
=
 +0.134 kJK-1mol-1 Positive value: the system becomes more dispersed
Δr G ⦵ 298K
=
 +91.4 kJmol-1 Positive value: the reaction is not feasible (spontaneous)
K eq 298K
=
 9.45 x 10-17 Value is less than 1: the reaction proceeds to the left
ΔG° = 0.0, and the system is at equilibrium, at a temperature of 981K (708°C)
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List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –

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