Chemical equilibrium between gases

For the equilibrium $ N_2O_4 \leftrightarrows 2NO_2 $ At $26.85^oC$ and 1 atm, we have: $K_p = $ 0.14 atm Let us determine $K$: We have: $K_p = $
.......... = .......... = .......... = .......... = ..........

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