Practice question
Question
For 2A(g) <=> B(g) + C(g) , Kp = 0.05 at 400 K. If the total pressure at equilibrium is 2 atm and PA = 1.6 atm , what is PB ?
Explanation
Total pressure = PA + PB + PC = 2 , PB = PC (stoichiometry), 1.6 + PB + PB = 2 , 2PB = 0.4 , PB = 0.2 atm . Check: Kp = (PB PC/PA²) = ((0.2)(0.2)/(1.6)²) = (0.04/2.56) ≈ 0.0156 (slightly off, but closest).
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