1 a. At 1280 oC, the equilibrium constant (Keq) for the reaction:  ClBr(g)  ⇔ Br(g)   +   Cl(g)  is 1.3x10-2 M.  If the initial concentrations are [ClBr] = 0.042 M, [Br] = 0.026 M, and [Cl] = 0.0 M, calculate the concentrations of these species at equilibrium. Show the algebraic expression and equilibrium concnetrations.

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