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Kc and Kp are equilibrium constants. Kc is the equilibrium constant in terms of concentration, while Kp is the equilibrium constant in terms of partial pressure. For the reaction H2 + I2 === 2HI all in gaseous state, Kc and Kp are related by the following equation: Kp = Kc(RT)^2, where R is the ideal gas constant and T is the temperature in Kelvin.