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The equilibrium constant, Kc, for the following reaction is 1.90x10^-3 at 244 K. 2NOBr(g) ⇌ 2NO(g) + Br2(g) When a sufficiently large sample of NOBr(g) is introduced into an evacuated vessel at 244 K, the equilibrium concentration of Br2(g) is found to be 0.177 M. Calculate the concentration of NOBr in the equilibrium mixture.