Practice question
Question
For A(g) + 2B(g) <=> 2C(g) , Kp = 0.25 at 400 K. If the total pressure at equilibrium is 4 atm and PA = 1 atm , what is PC ?
Explanation
Total pressure = PA + PB + PC = 4 , PB + PC = 3 . Kp = ((PC)²/PA (PB)²) = ((PC)²/1 · (3 - PC)²) = 0.25 , PC = 0.5 (3 - PC) , PC = 1.5 - 0.5 PC , 1.5 PC = 1.5 , PC = 1 atm .
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