equilibrium constants for gase can be expressed in terms of concentrations, Kc,

Question

equilibrium constants for gase can be expressed in terms of concentrations, Kc, or in terms of partial pressures, Kp. Which one of the following statements regarding Kc and Kp is correct? (A) Kc and Kp are equal when all stoichiometric coefficients in the balanced reaction equation equal one. (B) Kc and Kp have the same values but different units (C) Kc and Kp are equal when the sum of the stoichiometric coefficient for the products equal the sum of the stoichiometric coefficients for the reactants. (D) Kc and Kp can never be equal (e) Kc and Kp are equal when the conditions are standard (P= 1 atm, T=298 K)

Explanation / Answer

Kp = Kc/(RT)^delta n

when n =0

Kp =Kc

so, answer is (C)

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