[ursulan]

I need to construct a binary liquid-solid phase diagram for naphthalene-diphenylamine system.  Through the use of cooling curves, I've determined the heat of fusion and melting temperatures for each compound. Using,

Ln(Xa)=delta H/R(1/Ta -1/T)

I need to construct the liquidus curve, with temperature on the y axis and...something to do with mole fraction on the x axis. I've rearranged the equation into the form T=-deltaH/R*1/ln(Xa) +Ta so that y is the temperature and the melting point is the y intercept, but I'm not if this makes sense, or how I could create the graph on Excel.

I don't know if this is confusing, but if someone could help, I'd really appreciate it!