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April 3rd, 2018, 08:37 AM  #1 
Newbie Joined: Apr 2018 From: India Posts: 4 Thanks: 0  why Keq depends on how we write the equation?
For the rxn N2(g) +3H2(g) ⇌ 2NH3(g) Keq1 = ( [NH3]^2 ) / ( [N2] * [H2]^3 ) But for the same rxn, in different form 0.5N2(g) +1.5H2(g) ⇌ NH3(g) Keq2 = ( [NH3] ) / ( [N2]^0.5 * [H2]^1.5 ) Here Keq1 ≠ Keq2 But practically Keq should only depend on Temperature, so why is it affected on changing stoichiometric coefficients? 
April 6th, 2018, 11:38 AM  #2  
Member Joined: Jun 2017 From: Lima, Peru Posts: 40 Thanks: 1 Math Focus: Calculus  Quote:
As it was mentioned in that discussion what in ordinary arithmetic can be held true in practical terms does not. Equilibrium constants depend on the rate of reaction which is determined experimentally and this is the result from its mechanism therefore we cannot imply so easily that a fraction of whatever you're trying to use will held true.  

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