Question

which expression of Kc or Keq involved solution and gases only?

Answer 1

Answer:

The concentration of a pure liquid or solid equals its density divided by its molar mass. The density of a pure liquid or solid is the same, regardless of how much pure liquid or solid is present. Only the concentrations of gases and substances in solution are included in the equilibrium expression.

Answer 2

Answer:

When calculating equilibrium constants of solutions, the concentrations of each component in the solution are used to calculate K, which is the equilibrium constant. When working with concentrations, the equilibrium constant is designated as Kc. However, when working with a mixture of gases, concentrations are not used, but instead the gases' partial pressures. By first calculating the equilibrium constant in terms of pressure, designated Kp, Kc can then be calculated by using a simple formula.