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pentru sistemul PCl5 <> PCl3 + Cl2 la presiunea 1 atmosferă si temperatura 250 grade Celsius s-au găsit la echilibru: 0,6 moli PCl5, 1,4 moli PCl3 și 0,4 moli Cl2. Calculați Kc și raportul molar PCl5:PCl3 inițial