A 1.50 g sample of dinitrogen tetroxide is placed in a 2.00 L rigid flask at 298 K

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

A 1.50 g sample of dinitrogen tetroxide is placed in a 2.00 L rigid flask at 298 K, where it partially dissociates according to N2O4(g)⇌2NO2(g)\displaystyle \text{N}_{2}\text{O}_{4}(g)\rightleftharpoons 2\text{NO}_{2}(g). The total pressure at equilibrium is 0.270 atm. What is the value of KcK_{c} at 298 K? (a) 1.3×10−21.3\times10^{-2} (b) 1.2×10−31.2\times10^{-3} (c) 6.3×10−36.3\times10^{-3} (d) 2.6×10−42.6\times10^{-4}

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