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List Thermochemical Reactions Build-a-Reaction Synthlet

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Combustion of acetone
           +       4 3       +         3
Acetone
+
Oxygen
 
Reactants
 
Carbon dioxide
+
Steam
 
Products
 
Products – Reactants
Δf H ⦵
 
ΔfH⦵
 
Σf-react H ⦵
 
Δf H ⦵
 
ΔfH
 
 
Σf-prod H ⦵
 
Σf-prod H ⦵ - Σf-react H ⦵ = Δr H ⦵
(-248.1 x 1)
+
(0.0 x 4)
=
-248.10
 
(-393.5 x 3)
+
(-241.8 x 3)
=
-1,906.0
 
-1,906.0 - -248.1 = -1,657.9 kJmol-1
                             
S ⦵
 
S⦵
 
Σreact S ⦵
 
S ⦵
 
S
 
 
Σprod S ⦵
 
Σprod S ⦵ - Σreact S ⦵ = Δr S ⦵
(0.200 x 1)
+
(0.205 x 4)
=
1.021
 
(0.214 x 3)
+
(0.189 x 3)
=
1.208
 
1.208 - 1.021 = 0.187 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
Δr G ⦵   = Δr H ⦵ – (T 298 x Δr S ⦵)   =   -1,657.9– (298 x0.187)  =
-1,713.5kJmol-1
Δr H ⦵
=
 -1,657.9 kJmol-1 Negative value: the reaction is exothermic
Δr S ⦵
=
 +0.187 kJK-1mol-1 Positive value: the system becomes more dispersed
Δr G ⦵ 298K
=
 -1,713.5 kJmol-1 Negative value: the reaction is feasible (spontaneous)
K eq 298K
=
 >10100 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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© Mark R. Leach 1999 –

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