phase diagram for the solid liquid equilibrium of a binary mixture of silver (Ag) and copper (Cu) is shown below. Answer the following questions. Note that the weight percentage is on the bottom and the mole percentage is on the top.

(a) What is the lowest temperature at which a binary mixture can exist entirely in the liquid phase?
What is its composition?

(b) What is the most copper that can be present in a phase of solid silver? At what temperature does this occur?

(c) Consider a liquid mixture of 1 mole Ag and 4 moles Cu at 800°C. At equilibrium, what phases exist and what are their compositions? How many moles are present in each phase?

Transcribed Image Text:

C 1100 1900F 1000 1700F 900 1600F 800 1400F 700 1200F 600 1000F 500 850F 400 1084.5 7.9 Cu 10 J.C. Chaston 10 20 20 Ag-Cu Silver-Copper Atomic percentage silver 30 -780 30 40 50 60 70 80 90 40 50 60 Weight percentage silver 71.9 70 80 961.93 91.2 90 Ag