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Phosphorus Pentachloride Decomposes to Phosphorus Trichloride at High Temperatures According

Question 111

Multiple Choice

Phosphorus pentachloride decomposes to phosphorus trichloride at high temperatures according to the equation:
PCl5(g) ⇌ PCl3(g) + Cl2(g)
At 250° 0.125 M PCl5 is added to the flask.If Kc = 1.80,what are the equilibrium concentrations of each gas?


A) [PCl5] = 0.0 0765 M,[PCl3] = 0.117 M,and [Cl2] = 0.117 M
B) [PCl5] = 0.0625 M,[PCl3] = 0.335 M,and [Cl2] = 0.335 M
C) [PCl5] = 1.80 M,[PCl3] = 1.80 M,and [Cl2] = 1.80 M
D) [PCl5] = 3.96 M,[PCl3] = 3.83 M,and [Cl2] = 3.83 M

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