- #1
megid
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Homework Statement
Hi there, I'm very new here and I was hoping someone would be able to help me out a bit! I have a few questions but right now I'm going to start with this problem.
Elements A and B form ideal solutions in both liquid and solid phases. Compute the A-B phase diagram using the following data:
Element A: Melting point = 1000 (K), Heat of fusion (J/mol) = 8314
Element B: Melting point = 800 (K), Heat of fusion (J/mol) = 6651
Homework Equations
Some equations that I tried to figure out to use would be
H=TS
to calculate the entropy of tranformation from the heat of fusion at the melting temperature
K1 = e^-(S1*(T(1000)-T)/RT)
K2 = e&-(S2*(T(800)-T)/RT)
X2alpha = (K1-1)/(K1-K2)
X2beta = K2*X2alpha
The Attempt at a Solution
What I tried to do was calculate the entropy of formation first, then calculate G from the melting temperature range 800-1000. I then tried to calculate the K values, and accordingly, the X values as well... but my numbers seemed a little crazy. I'm pretty sure I have to plot the G value vs composition at an interval of temperatures to start plotting my phase diagram, but I'm at a loss right now. Could someone please help!