At a given temperature, 4.595 atm of F2 and 5.404 atm of Br2 are mixed and allowed to come to equilibrium. The equilibrium pressure of BrF is found to be 1.268 atm. Calculate Kp for the reaction at this temperature. F2(g) + Br2(g) ⇌ 2 BrF(g) *The answer is 8.51E-2 , but I would like an explanation

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