4. (20 pts.) Below is a liquid-solid phase diagram for a mixture of two components, A and B. 700 T(K) 800 750 p liquid 650 600 550 500 450 400 40 350 300 0 01 02 03 04 05 06 07 08 09 1 24 (a) For the points labeled 1 through 4 along the vertical line at 20.2, provide the number of phases pret a description of each phase, and the mole fraction of B in each phase. (To receive full credit, descriptions must be clear and unambiguous.) I (b) What is the melting temperature of pure A? © What is the melting temperature of pure B? (d) What is the eutectic temperature? (e) What is the eutectic composition? ( What is the freezing point of a liquid with 2-0.27 (C) For the two-component system described by the phase diagram in problem #4, sketch cooling curves for solutions with Zp = 0,25 = 0.2, and zp = 0.4. The cooling curves should start at 800 K. What quantity does the horizontal axis correspond to?

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