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There are 5.3 moles of n2o4 and 2.3 moles of no2 in a 5 liters container. Find the Kc for this reaction:
n2o4 ⇋ 2no2

Kc = 0.20        

Explanation:

                  N₂O₄     ⇄    2NO₂

moles       5.3mol          2.3mol

Vol               5L                5L

Molarity    5.3/5M        2.3/5M

                = 1.06M     = 0.46M

Kc = [NO₂]²/[N₂O₄] =  (0.46)²/(1.06) = 0.1996 ≅ 0.20