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List Thermochemical Reactions Build-a-Reaction Synthlet

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Acetylene decomposing to its elements
     2       +        
Acetylene
 
Reactants
 
Carbon
+
Hydrogen
 
Products
 
Products – Reactants
Δf H ⦵
 
 
Σf-react H ⦵
 
Δf H ⦵
 
ΔfH
 
 
Σf-prod H ⦵
 
Σf-prod H ⦵ - Σf-react H ⦵ = Δr H ⦵
(226.7 x 1)
=
226.73
 
(0.0 x 2)
+
(0.0 x 1)
=
0.0
 
0.0 - 226.7 = -226.7 kJmol-1
                             
S ⦵
 
 
Σreact S ⦵
 
S ⦵
 
S
 
 
Σprod S ⦵
 
Σprod S ⦵ - Σreact S ⦵ = Δr S ⦵
(0.201 x 1)
=
0.201
 
(0.006 x 2)
+
(0.131 x 1)
=
0.142
 
0.142 - 0.201 = -0.059 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
Δr G ⦵   = Δr H ⦵ – (T 298 x Δr S ⦵)   =   -226.7– (298 x-0.059)  =
-209.2kJmol-1
Δr H ⦵
=
 -226.7 kJmol-1 Negative value: the reaction is exothermic
Δr S ⦵
=
 -0.059 kJK-1mol-1 Negative value: the system becomes less dispersed
Δr G ⦵ 298K
=
 -209.2 kJmol-1 Negative value: the reaction is feasible (spontaneous)
K eq 298K
=
 4.69 x 10+36 Value is greater than 1: the reaction proceeds to the right
ΔG° = 0.0, and the system is at equilibrium, at a temperature of 3,857K (3,584°C)
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List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –

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