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First option is incorrect as the value of Kp given is wrong. It should have been:

1. Kp = PCO2 / PCH4 × [PO2]²
2. Kp = PCO2 / PCH4 × [PO2]
3. Kp = PCO2 / PCH4 × [PO2]³
4. Kp = PCO2 / PCH4 × [PO2]⁴

Correct answer: Kp = PCO2 / PCH4 × [PO2]³

Solution

The equilibrium constant Kp is determined by the stoichiometric coefficients in the balanced chemical equation. Based on the given options, the correct expression involves [PO2] raised to the power of 3, which matches the stoichiometry.

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