In which of the following equilibria will Kc and Kp have the same value ?
Correct answer: D. N2 + O2 = 2NO
- A. PCI5 = PCI3 + Cl2
- B. N2 + 3H2 = 2NH
- C. 2CO + O2 = CO2
- D. N2 + O2 = 2NO
Explanation
Kp and Kc are related by Kp = Kc(RT)^delta n, so they have the same numerical value when the change in gaseous moles, delta n, is zero. For N2(g) + O2(g) ⇌ 2NO(g), delta n = 2 - (1 + 1) = 0. The common trap is option a, where delta n = 2 - 1 = 1, so Kp and Kc are not equal.
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