When a mixture of PH3, P2, and H2 comes to equilibrium at 873 K according to the reaction

2PH3 (g) ←-→P2 (g) + 3H2 (g) Kp = 398 at 873 K,

where Pp2 = 0.414 atm and PH2 = 0.827 atm.

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