Consider the equilibrium system described by the chemical reaction below, which has a value of Kp equal to 4.18 × 10⁻⁹ at a certain temperature. If an initial mixture of 0.20 atm HBr, 0.010 atm H₂, and 0.010 atm Br₂ reacts, what will the equilibrium partial pressure of HBr be?

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