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Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Partial combustion of carbon to carbon monoxide
    2       +       2
Carbon
+
Oxygen
 
Reactants
 
Carbon monoxide
 
Products
 
Products – Reactants
ΔfH
 
ΔfH
 
Σf-reactH
 
ΔfH
 
 
 
Σf-prodH
 
Σf-prodH - Σf-reactH = ΔrH
(0.0 x 2)
+
(0.0 x 1)
=
0.00
 
(-110.5 x 2)
=
-221.1
 
-221.1 - 0.0 = -221.1 kJmol-1
                             
S
 
S
 
ΣreactS
 
S
 
 
 
ΣprodS
 
ΣprodS - ΣreactS = ΔrS
(0.006 x 2)
+
(0.205 x 1)
=
0.217
 
(0.198 x 2)
=
0.395
 
0.395 - 0.217 = 0.179 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
ΔrG   = ΔrH – (T298 x ΔrS)   =   -221.1– (298 x 0.179)  =
-274.3kJmol-1
ΔrH
=
-221.1 kJmol-1 Negative value: the reaction is exothermic
ΔrS
=
+0.179 kJK-1mol-1 Positive value: the system becomes more dispersed
ΔrG 298K
=
-274.3 kJmol-1 Negative value: the reaction is feasible (spontaneous)
Keq 298K
=
1.21 x 10+48 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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List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –


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