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The question I'm looking at is enter image description here

I found that that Kc = 139M^-1, but how can I determine Kp? There is no temperature given, but I was told that it is still possible to calculate.

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  • $\begingroup$ Why do you think you need the temperature in this case to calculate $K_p$? $\endgroup$ – a-cyclohexane-molecule Nov 10 '18 at 13:17
  • $\begingroup$ HINT - Assume ideal gas behavior. $\endgroup$ – MaxW Nov 10 '18 at 13:58
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$K_p=K_c(RT)^{\Delta n_g}$(try to prove this yourself) where $\Delta n_g$ is number of gaseous products -Number of gaseous reactants.

In your question, $\Delta n_g=0$ so $K_p=K_c=2.43$

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  • $\begingroup$ Thank you! If the number of gaseous products was not 0, would this still be solvable? For example, in this question: i.gyazo.com/0cf8ffd4c95e126583a973e3b768b30a.png $\endgroup$ – shuriken313 Nov 10 '18 at 3:28
  • $\begingroup$ Yes. Kc can directly be found.Hint: No of moles directly proportional to concentration. Kp = Kx * (P_total/(total number of moles))^∆ng $\endgroup$ – user600016 Nov 10 '18 at 5:11

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