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When we refer to the textbook table for the homework problems how do we know which equilibrium constant to use? I used a Kc value for a question asking to find the equilibrium concentrations, but the homework used the K value. I assumed that K by itself should only be used for finding partial pressures? (For reference the two values were different for this reaction so I went with Kc rather than K).
Hi, so when the homework tells you to look at Table 5G.2 for the K value, you look at the temperature they give you in the problem and then locate the K value that has that respective temperature. Hope this helps!
When you are calculating for the equilibrium constant from the thermodynamics table (using Gibbs free energy for example) then you can only use K but other than that you can use Kc if you want to find the equilibrium in terms of molar concentration rather than partial pressure.
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