\(PCl_{5}\) is dissociating 50% at 250°C at a total pressure of \( P \) atm. If the equilibrium constant is \( K_p \), then which of the following relation is numerically correct?
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For dissociation reactions, the equilibrium constant \( K_p \) can be calculated using the partial pressures of the reactants and products. Ensure that the stoichiometry of the reaction is correctly accounted for in the calculations.