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A reaction vessel is charged with hydrogen iodide, which partially decomposes to molecular hydrogen and iodine: 2HI (g) ⇌ H2(g) + I2(g) When the system comes to equilibrium at 425°C, PHI= 0.708 atm, and PH2 = PI2 = 0.0960 atm. The value of Kp at this temperature is __________. A) 1.30 × 10^-2 B) 1.84 × 10^-2 C) Kp cannot be calculated for this gas reaction when the volume of the reaction vessel is not given. D) 6.80 × 10^-2 E) 54.3