Multiple Choice
Gaseous hydrogen bromide decomposes at elevated temperatures according to the following equation: 2 HBr(g) ⇌ H2(g) + Br2(g). At a certain temperature, a 2.00 L flask is initially filled only with 0.600 mol of HBr. If the equilibrium concentration of H2 is 0.100 M, what is the value of Kc at that temperature?