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A sample of S8 (g) is placed in a container at 1325 K at an initial pressure of 1.00 atm, where it decomposes to S2 (g) by the reaction

S8 (g) <---> 4S2 (g)

At equilibrium, the partial pressure of S8 (g) is 0.25 atm. The Kp at 1325K is

A) Kp = 324
B) Kp = 36
C) Kp = 0.25
D) Kp = 81
E) Kp = 4

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