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For 2A(g) + B(g) <=> 2C(g) , Kp = 16 at 400 K. If the total pressure at equilibrium is 5 atm and PA = 2 atm , what is PC ?

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2.0 atm 1.5 atm 3.0 atm 2.85 atm Correct

Total pressure = PA + PB + PC = 5 , PB + PC = 3 , Kp = ((PC)²/PA² PB) = ((PC)²/4 (3 - PC)) = 16 , PC² = 192 - 64 PC , PC ≈ 2.85 atm .

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