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How does the equilibrium constant Keq resemble, and how does it differ from, Kc and Kp?
The thermodynamic equilibrium constant Keq is formally written in terms of activities, a unitless quantity. Activities are approximated by using solution concentrations in units of molarity (divided by 1 M to remove the units) and gas partial pressures in units of atm (divided by 1 atm to remove the units). Kc is written solely in terms of molarity and Kp is written solely in terms of partial pressures. Keq can mix "units".