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List Thermochemical Reactions Build-a-Reaction Synthlet

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
The Contact process
    2       +       2
Sulfur dioxide
+
Oxygen
 
Reactants
 
Sulfur trioxide
 
Products
 
Products – Reactants
Δf H ⦵
 
ΔfH⦵
 
Σf-react H ⦵
 
Δf H ⦵
 
 
 
Σf-prod H ⦵
 
Σf-prod H ⦵ - Σf-react H ⦵ = Δr H ⦵
(-296.8 x 2)
+
(0.0 x 1)
=
-593.66
 
(-395.7 x 2)
=
-791.4
 
-791.4 - -593.7 = -197.8 kJmol-1
                             
S ⦵
 
S⦵
 
Σreact S ⦵
 
S ⦵
 
 
 
Σprod S ⦵
 
Σprod S ⦵ - Σreact S ⦵ = Δr S ⦵
(0.248 x 2)
+
(0.205 x 1)
=
0.702
 
(0.257 x 2)
=
0.514
 
0.514 - 0.702 = -0.188 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
Δr G ⦵   = Δr H ⦵ – (T 298 x Δr S ⦵)   =   -197.8– (298 x-0.188)  =
-141.7kJmol-1
Δr H ⦵
=
 -197.8 kJmol-1 Negative value: the reaction is exothermic
Δr S ⦵
=
 -0.188 kJK-1mol-1 Negative value: the system becomes less dispersed
Δr G ⦵ 298K
=
 -141.7 kJmol-1 Negative value: the reaction is feasible (spontaneous)
K eq 298K
=
 6.98 x 10+24 Value is greater than 1: the reaction proceeds to the right
ΔG° = 0.0, and the system is at equilibrium, at a temperature of 1,052K (779°C)
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List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –

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