Does X=n? X is the element fraction in a compound, and n is the mole number of an element.
It may or may not depending on the basis.
The mole number is usually given as a 'whole number' or 'integer', e.g. Al2O3 or C2H4.
Mass fractions and mole fractions are different.
Please provide an example.
Ex. For a binary solution, there's a graph with the Gibbs free energy of componet A on the left y axis, Gibbs free energy of componet B on the right y axis, and with XB as the x axis.
See the bottom diagram on pg6 of http://addis.caltech.edu/research/gibbs.pdf#search="gibbs free energy in binary solution"
the straight line that passes through point (4) and (5) also equals the chemical potential on intersecting the left and right y axes. Therefore, I'm wondering if dn=dx, because the definition for
Xi = mole fraction of i = Ni / ΣNi
x is written in terms of the mole fraction of one of the components,
If the (molar) gibbs free energy of pure A is gA, and that of pure B is gB, then the (molar) gibbs free energy for the combination of pure components is g (pure, combined) = gA•XA + gB•XB
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