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Review Question 17.16

How does the equilibrium constant K_{eq} resemble, and how does it differ from, K_{c} and K_{p}?

The thermodynamic equilibrium constant K_{eq} 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). K_{c} is written solely in terms of molarity and K_{p} is written solely in terms of partial pressures. K_{eq} can mix "units".