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List Thermochemical Reactions Build-a-Reaction Synthlet

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Carbon monnoxide plus water gives hydrogen plus carbon dioxide equilibrium
           +             +        
Carbon monoxide
+
Water
 
Reactants
 
Hydrogen
+
Carbon dioxide
 
Products
 
Products – Reactants
Δf H ⦵
 
ΔfH⦵
 
Σf-react H ⦵
 
Δf H ⦵
 
ΔfH
 
 
Σf-prod H ⦵
 
Σf-prod H ⦵ - Σf-react H ⦵ = Δr H ⦵
(-110.5 x 1)
+
(-285.8 x 1)
=
-396.36
 
(0.0 x 1)
+
(-393.5 x 1)
=
-393.5
 
-393.5 - -396.4 = 2.9 kJmol-1
                             
S ⦵
 
S⦵
 
Σreact S ⦵
 
S ⦵
 
S
 
 
Σprod S ⦵
 
Σprod S ⦵ - Σreact S ⦵ = Δr S ⦵
(0.198 x 1)
+
(0.070 x 1)
=
0.268
 
(0.131 x 1)
+
(0.214 x 1)
=
0.344
 
0.344 - 0.268 = 0.077 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
Δr G ⦵   = Δr H ⦵ – (T 298 x Δr S ⦵)   =   2.9– (298 x0.077)  =
-20.0kJmol-1
Δr H ⦵
=
 +2.9 kJmol-1 Positive value: the reaction is endothermic
Δr S ⦵
=
 +0.077 kJK-1mol-1 Positive value: the system becomes more dispersed
Δr G ⦵ 298K
=
 -20.0 kJmol-1 Negative value: the reaction is feasible (spontaneous)
K eq 298K
=
 3,270 Value is greater than 1: the reaction proceeds to the right
ΔG° = 0.0, and the system is at equilibrium, at a temperature of 37K (-236°C)
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List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –

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