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For the equilibrium A(s) <-> M(s) + 1/2 O2(g), the equilibrium constant is Kp = 4. What is the equilibrium partial pressure of O2 (in atm)?

1. 16
2. 4
3. 2
4. 8

Correct answer: 16

Solution

With solids excluded, Kp = (pO2)^(1/2) = 4, so pO2 = 4² = 16 atm.

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