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R = 0.082 L ⋅ atm/mol ⋅ K Homogeneous Equilibrium
Why equilibrium constants are reported without units?
The equilibrium constant is not related to the kinetics of
a reaction as well as the thermodynamics of the process.
K ∼ a ctivities c o n cen tratio n s
K ∼≠ p artial p ressu re
In a n id e a l m ixtu re :
[C a ]
[C A ]
a referen c e co n cen tratio n
a referen c e p re ssu re 1 atm
100kPa A a ctivity =
A a ctivity “Ion Pairing” F o r p u re so lid :
A a ctivity ( so lid ) = 1
F o r p u re liq u id :
A a ctivity ( liq u id )= 1 A ctivities o f ch em ica ls h a ve n o u n it ! Homogeneous Equilibrium
In aqueous solution: aA(aq ) + bB (aq )
c cC (aq ) + dD (aq )
d [C / c ] ⋅ [ D / c ]
[ A / c ] ⋅[B / c ] c = 1 mol / L without unit In gas phase: aA( g ) + bB ( g )
c cC ( g ) + dD ( g )
d ( pc / p ) ⋅ ( pd / p )
( pa / p ) a ⋅ ( pb / p )b p = 1atm
without unit Homogeneous Equilibrium
How to express the equilibrium constants for the following reactions
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This document was uploaded on 02/26/2014.
- Fall '14