Periodic Table
T-Shirts & more
from the
meta-synthesis



Merch Store

previous home next

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Dioxygen (O2) ozone (O3) equilibrium
    3 2
Oxygen
 
Reactants
  
Ozone
 
Products
  
Products – Reactants
ΔfH⦵
  
 
Σf-reactH⦵
  
ΔfH⦵
  
 
 
Σf-prodH⦵
  
Σf-prodH⦵ - Σf-reactH⦵ = ΔrH⦵
(0.0 x 3)
=
0.00
 
(142.7 x 2)
=
285.4
 
285.4 - 0.0 = 285.4 kJmol-1
                             
S⦵
  
 
ΣreactS⦵
  
S⦵
  
 
 
ΣprodS⦵
  
ΣprodS⦵ - ΣreactS⦵ = ΔrS⦵
(0.205 x 3)
=
0.615
 
(0.239 x 2)
=
0.478
 
0.478 - 0.615 = -0.138 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
  
ΔrG⦵   = ΔrH⦵ – (T298 x ΔrS⦵)   =   285.4– (298 x -0.138)  =
+326.4kJmol-1
ΔrH⦵
=
 +285.4 kJmol-1 Positive value: the reaction is endothermic
ΔrS⦵
=
 -0.138 kJK-1mol-1 Negative value: the system becomes less dispersed
ΔrG⦵ 298K
=
 +326.4 kJmol-1 Positive value: the reaction is not feasible (spontaneous)
Keq 298K
=
 6.16 x 10-58 Value is less than 1: the reaction proceeds to the left
No equilibrium temperature: this reaction is not feasible at any temperature
previous home next
List Thermochemical Reactions Build-a-Reaction Synthlet

© Mark R. Leach 1999 –

Queries, Suggestions, Bugs, Errors, Typos...

If you have any:

Queries
Comments
Suggestions
Suggestions for links
Bug, typo or grammatical error reports about this page,

please contact Mark R. Leach, the author, using mark@meta-synthesis.com

This free, open access web book is an ongoing project and your input is appreciated.