H2 (gas) + O2 (gas) <-> H2O2 (gas) Pure H2O2 (gas) is introduced into a

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constant (4.083 atm) pressure reactor.? H2 (gas) + O2 (gas) <->H2O2 (gas)
Pure H2O2 (gas) is introduced into a constant (4.083 atm) pressure reactor at 261.4 C. As the reaction proceeds towards equilibrium, the temperature and pressure are held constant, but the equilibrium reactor volume is found to be 51.98% larger than the initial volume. What is the equilibrium constant, Kp, for the reaction at this temperature?