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Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Carbon plus carbon dioxide gives carbon monoxide equilibrium
           +       2
Carbon
+
Carbon dioxide
 
Reactants
 
Carbon monoxide
 
Products
 
Products – Reactants
ΔfH
 
ΔfH
 
Σf-reactH
 
ΔfH
 
 
 
Σf-prodH
 
Σf-prodH - Σf-reactH = ΔrH
(0.0 x 1)
+
(-393.5 x 1)
=
-393.51
 
(-110.5 x 2)
=
-221.1
 
-221.1 - -393.5 = 172.5 kJmol-1
                             
S
 
S
 
ΣreactS
 
S
 
 
 
ΣprodS
 
ΣprodS - ΣreactS = ΔrS
(0.006 x 1)
+
(0.214 x 1)
=
0.219
 
(0.198 x 2)
=
0.395
 
0.395 - 0.219 = 0.176 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
ΔrG   = ΔrH – (T298 x ΔrS)   =   172.5– (298 x 0.176)  =
+120.0kJmol-1
ΔrH
=
+172.5 kJmol-1 Positive value: the reaction is endothermic
ΔrS
=
+0.176 kJK-1mol-1 Positive value: the system becomes more dispersed
ΔrG 298K
=
+120.0 kJmol-1 Positive value: the reaction is not feasible (spontaneous)
Keq 298K
=
9.09 x 10-22 Value is less than 1: the reaction proceeds to the left
ΔG° = 0.0, and the system is at equilibrium, at a temperature of 981K (708°C)

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List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –


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