In case of gases Kc is replaced by_______________?
Correct answer: C. Kp
- A. Ka
- B. Kb
- C. Kp
- D. K
Explanation
For gaseous equilibria, an equilibrium constant can be written in terms of partial pressures as Kp rather than concentrations as Kc. The two are related by Kp = Kc(RT)^Δn, so they are not generally numerically identical. The likely mistake is choosing K because it ignores whether the equilibrium expression uses concentrations or pressures.
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About Reversible Reactions
A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.
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