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List Thermochemical Reactions Build-a-Reaction Synthlet

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Dioxygen (O2) ozone (O3) equilibrium
    3 2
Oxygen
 
Reactants
 
Ozone
 
Products
 
Products – Reactants
Δf H ⦵
 
 
Σf-react H ⦵
 
Δf H ⦵
 
 
 
Σf-prod H ⦵
 
Σf-prod H ⦵ - Σf-react H ⦵ = Δr H ⦵
(0.0 x 3)
=
0.00
 
(142.7 x 2)
=
285.4
 
285.4 - 0.0 = 285.4 kJmol-1
                             
S ⦵
 
 
Σreact S ⦵
 
S ⦵
 
 
 
Σprod S ⦵
 
Σprod S ⦵ - Σreact S ⦵ = Δr S ⦵
(0.205 x 3)
=
0.615
 
(0.239 x 2)
=
0.478
 
0.478 - 0.615 = -0.138 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
Δr G ⦵   = Δr H ⦵ – (T 298 x Δr S ⦵)   =   285.4– (298 x-0.138)  =
+326.4kJmol-1
Δr H ⦵
=
 +285.4 kJmol-1 Positive value: the reaction is endothermic
Δr S ⦵
=
 -0.138 kJK-1mol-1 Negative value: the system becomes less dispersed
Δr G ⦵ 298K
=
 +326.4 kJmol-1 Positive value: the reaction is not feasible (spontaneous)
K eq 298K
=
 6.16 x 10-58 Value is less than 1: the reaction proceeds to the left
No equilibrium temperature: this reaction is not feasible at any temperature
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List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –

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