1. The problem statement, all variables and given/known data A 1.0 dm3 reaction vessel contains initially 1.0 mol of N2O4(g) and 1.0 mol of NO2(g). At equilibrium, 0.75mol of N2O4(g) are present. What is the value of Kc? A. 0.33 B. 0.50 C. 2.0 D. 3.0 3. The attempt at a solution Right answer = D, but I do not why. My attempt for Kc is (3/4)^2 / (9/8) = 0.5, so wrong answer. Please, help me with this stricky one.