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List Thermochemical Reactions Build-a-Reaction Synthlet

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Hydrogen radical plus oxygen gives hydrogen peroxide radical
           +      
Hydrogen radical
+
Oxygen
 
Reactants
 
Hydrogen peroxide radical
 
Products
 
Products – Reactants
Δf H ⦵
 
ΔfH⦵
 
Σf-react H ⦵
 
Δf H ⦵
 
 
 
Σf-prod H ⦵
 
Σf-prod H ⦵ - Σf-react H ⦵ = Δr H ⦵
(218.0 x 1)
+
(0.0 x 1)
=
217.97
 
(2.1 x 1)
=
2.1
 
2.1 - 218.0 = -215.9 kJmol-1
                             
S ⦵
 
S⦵
 
Σreact S ⦵
 
S ⦵
 
 
 
Σprod S ⦵
 
Σprod S ⦵ - Σreact S ⦵ = Δr S ⦵
(0.115 x 1)
+
(0.205 x 1)
=
0.320
 
(0.229 x 1)
=
0.229
 
0.229 - 0.320 = -0.091 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
Δr G ⦵   = Δr H ⦵ – (T 298 x Δr S ⦵)   =   -215.9– (298 x-0.091)  =
-188.8kJmol-1
Δr H ⦵
=
 -215.9 kJmol-1 Negative value: the reaction is exothermic
Δr S ⦵
=
 -0.091 kJK-1mol-1 Negative value: the system becomes less dispersed
Δr G ⦵ 298K
=
 -188.8 kJmol-1 Negative value: the reaction is feasible (spontaneous)
K eq 298K
=
 1.24 x 10+33 Value is greater than 1: the reaction proceeds to the right
ΔG° = 0.0, and the system is at equilibrium, at a temperature of 2,376K (2,103°C)
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List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –

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