What is the value of the equilibrium constant for the reaction below if the partial pressures at equilibrium are [PH3] = 0.022 atm, [P2] = 0.289 atm, and [H2] = 0.867 atm at 873 K? 2 PH3 (g) ⇌ P2 (g) + 3 H2 (g)

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