Please show all steps and explain each step! 4. Your grandma gives you a present

Question

Please show all steps and explain each step!

4. Your grandma gives you a present, her most prized possession: an Um of pure Gold. One afternoon, while mixing paint-remover in the urn, you are disturbed to note that it has turned an evil green in color. Whipping out your magnifying glass, you observe that the paint remover, in attacking the urn, has also etched it, clearly revealing the presence of two phases. This (of course) raises in your mind certain nagging doubts as to the purity of the Gold. Your friend with an electron microprobe analyzer performs a quick chemical analysis for you, with the distressing result: (A&J; Appendix I, Problem 4.2) 60 Copper at% Zinc Gold

Explanation / Answer

The constitution point onto the diagram is the coordinate with (40,200) Two-phase region (copper-rich solid) and (the compound CuZn). WZn 33%, WZn 48%

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