# Fx cxzx

We can determine the concentration in each phase by rearranging the equation, to give

At equilibrium, the fx values for all phases are identical, equal to /, say. Thus, if we know /, we can determine the concentration in each phase from the simplified equation

As in chemical equilibrium problems, we usually know the total number of moles, ntotai, of the material. As in chemical problems, it is useful to state the mass conservation condition: the sum of the equilibrium number of moles, nx, present in each phase x must add up to ntota|. By definition, each nx is equal to the concentration Cx times the volume Vx for the phase:

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