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



Merch Store

previous home next
List Thermochemical Reactions Build-a-Reaction Synthlet

Thermochemistry: Play With Reaction Synthlet


    
   or    Kelvin        
Hydrogenation to ethylene to ethane
           +      
Ethylene
+
Hydrogen
 
Reactants
 
Ethane
 
Products
 
Products – Reactants
Δf H ⦵
 
ΔfH⦵
 
Σf-react H ⦵
 
Δf H ⦵
 
 
 
Σf-prod H ⦵
 
Σf-prod H ⦵ - Σf-react H ⦵ = Δr H ⦵
(52.3 x 1)
+
(0.0 x 1)
=
52.26
 
(-84.7 x 1)
=
-84.7
 
-84.7 - 52.3 = -136.9 kJmol-1
                             
S ⦵
 
S⦵
 
Σreact S ⦵
 
S ⦵
 
 
 
Σprod S ⦵
 
Σprod S ⦵ - Σreact S ⦵ = Δr S ⦵
(0.220 x 1)
+
(0.131 x 1)
=
0.350
 
(0.230 x 1)
=
0.230
 
0.230 - 0.350 = -0.121 kJK-1mol-1
Gibbs free energy at 298K (standard conditions and standard temperature):
 
Δr G ⦵   = Δr H ⦵ – (T 298 x Δr S ⦵)   =   -136.9– (298 x-0.121)  =
-101.0kJmol-1
Δr H ⦵
=
 -136.9 kJmol-1 Negative value: the reaction is exothermic
Δr S ⦵
=
 -0.121 kJK-1mol-1 Negative value: the system becomes less dispersed
Δr G ⦵ 298K
=
 -101.0 kJmol-1 Negative value: the reaction is feasible (spontaneous)
K eq 298K
=
 5.03 x 10+17 Value is greater than 1: the reaction proceeds to the right
ΔG° = 0.0, and the system is at equilibrium, at a temperature of 1,135K (862°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.