Consider the following reaction:   2 AB (g) + C2 (g) ⇄ 2 ACB (g)      Kc = 72.06  If the equilibrium concentrations of ACB and C2 are 0.597 M and 0.122 M, respectively. What is the equilibrium concentration of AB? Report your answer with three decimals. Enter numbers only; do not enter units.

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