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List Thermochemical Reactions Build-a-Reaction Synthlet

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Oxidation of nitrogen to nitric oxide
           +       2
Nitrogen
+
Oxygen
 
Reactants
 
Nitric oxide
 
Products
 
Products – Reactants
Δf H ⦵
 
ΔfH⦵
 
Σf-react H ⦵
 
Δf H ⦵
 
 
 
Σf-prod H ⦵
 
Σf-prod H ⦵ - Σf-react H ⦵ = Δr H ⦵
(0.0 x 1)
+
(0.0 x 1)
=
0.00
 
(90.3 x 2)
=
180.5
 
180.5 - 0.0 = 180.5 kJmol-1
                             
S ⦵
 
S⦵
 
Σreact S ⦵
 
S ⦵
 
 
 
Σprod S ⦵
 
Σprod S ⦵ - Σreact S ⦵ = Δr S ⦵
(0.192 x 1)
+
(0.205 x 1)
=
0.397
 
(0.211 x 2)
=
0.422
 
0.422 - 0.397 = 0.025 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
Δr G ⦵   = Δr H ⦵ – (T 298 x Δr S ⦵)   =   180.5– (298 x0.025)  =
+173.1kJmol-1
Δr H ⦵
=
 +180.5 kJmol-1 Positive value: the reaction is endothermic
Δr S ⦵
=
 +0.025 kJK-1mol-1 Positive value: the system becomes more dispersed
Δr G ⦵ 298K
=
 +173.1 kJmol-1 Positive value: the reaction is not feasible (spontaneous)
K eq 298K
=
 4.53 x 10-31 Value is less than 1: the reaction proceeds to the left
ΔG° = 0.0, and the system is at equilibrium, at a temperature of 7,287K (7,014°C)
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List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –

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