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Given the reaction at a certain temperature: 2 HI(g) ⇌ H2(g) + I2(g). At equilibrium, the partial pressure of HI is 1.8 × 10-3 atm, and the partial pressures for H2 and I2 are 0.10 atm each. Find Kp at that temperature. A) 3.1 × 10^4 B) 3.2 × 10^-4 C) 5.6 × 10^1 D) 3.1 × 10^3