Consider the following reaction: A2 (g) + B2 (g) 2AB (g) Kp = 25.6 The three species are mixed in a 5.000 L flask and have the following partial pressures: PAB = 0.520 atm, PA = 0.020 atm, PB = 0.450 atm. What is the equilibrium partial pressure of AB in atm? Report your answer with four decimals. Enter numbers only; do not enter units.