At some temperature, 0.765 moles of NO(g) and 0.400 moles of O2(g) are introduced into a 1.00 L reaction vessel and allowed to come to equilibrium according to the following equation:
2NO(g) + O2(g) → 2 NO2(g)
At equilibrium, there are 0.725 moles of NO2(g) formed. What is the value of Kc?
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