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List Thermochemical Reactions Build-a-Reaction Synthlet

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Decomposition of ozone to oxygen
    2 3
Ozone
 
Reactants
 
Oxygen
 
Products
 
Products – Reactants
Δf H ⦵
 
 
Σf-react H ⦵
 
Δf H ⦵
 
 
 
Σf-prod H ⦵
 
Σf-prod H ⦵ - Σf-react H ⦵ = Δr H ⦵
(142.7 x 2)
=
285.40
 
(0.0 x 3)
=
0.0
 
0.0 - 285.4 = -285.4 kJmol-1
                             
S ⦵
 
 
Σreact S ⦵
 
S ⦵
 
 
 
Σprod S ⦵
 
Σprod S ⦵ - Σreact S ⦵ = Δr S ⦵
(0.239 x 2)
=
0.478
 
(0.205 x 3)
=
0.615
 
0.615 - 0.478 = 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 x0.138)  =
-326.4kJmol-1
Δr H ⦵
=
 -285.4 kJmol-1 Negative value: the reaction is exothermic
Δr S ⦵
=
 +0.138 kJK-1mol-1 Positive value: the system becomes more dispersed
Δr G ⦵ 298K
=
 -326.4 kJmol-1 Negative value: the reaction is feasible (spontaneous)
K eq 298K
=
 1.62 x 10+57 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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