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SOLVED: A bar of aluminum is contaminated with copper at a concentration e times the acceptable limit. It is to be purified by directional solidification, with a planar growth front. Estimate the fraction of the bar that will have an acceptable purity.Given: Tm (Al) 660°C, TE 548°C, Xmax 5.65 wt%, and XEutectic 33.2 wt% Cu.