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



Merch Store

previous home next

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Hydrogenation of 1-butene
           +      
1-Butene
 +
Hydrogen
  
Reactants
  
Butane
 
Products
  
Products – Reactants
ΔfH⦵
  
ΔfH⦵
 
Σf-reactH⦵
  
ΔfH⦵
  
 
 
Σf-prodH⦵
  
Σf-prodH⦵ - Σf-reactH⦵ = ΔrH⦵
(-0.1 x 1)
+
(0.0 x 1)
=
-0.13
 
(-126.2 x 1)
=
-126.2
 
-126.2 - -0.1 = -126.0 kJmol-1
                             
S⦵
  
S⦵
 
ΣreactS⦵
  
S⦵
  
 
 
ΣprodS⦵
  
ΣprodS⦵ - ΣreactS⦵ = ΔrS⦵
(0.306 x 1)
+
(0.131 x 1)
=
0.436
 
(0.310 x 1)
=
0.310
 
0.310 - 0.436 = -0.126 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
  
ΔrG⦵   = ΔrH⦵ – (T298 x ΔrS⦵)   =   -126.0– (298 x -0.126)  =
-88.4kJmol-1
ΔrH⦵
=
 -126.0 kJmol-1 Negative value: the reaction is exothermic
ΔrS⦵
=
 -0.126 kJK-1mol-1 Negative value: the system becomes less dispersed
ΔrG⦵ 298K
=
 -88.4 kJmol-1 Negative value: the reaction is feasible (spontaneous)
Keq 298K
=
 3.15 x 10+15 Value is greater than 1: the reaction proceeds to the right
ΔG° = 0.0, and the system is at equilibrium, at a temperature of 999K (726°C)
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.