At 298 °C, the equilibrium constant (Keq) for the reaction:  H2 (g)   +   Br2 (g)  →  2HBr (g)  is 45.3. If the initial concentration are [H2] = 0.124 M, [Br2] = 0.228 M, and [HBr] = 0.0 M, calculate the concentration of the species at equilibrium.

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