131.Solving a chemistry problem8

131.Solving a chemistry problem8

10. Using the diagram (Fig. 23) “Melting point - composition of the Mg-Pb system”, answer the following questions.
1. What is phase, independent component, number of degrees of freedom?
2. What is the variation of a system containing 30 and 90% Pb at 500 K and 200 K, respectively?
3. Which of the system components is the most refractory?
4. At what temperature will crystallization of a melt containing 50% Mg begin?
5. At what temperature will the melt completely harden in a system of the same composition?
6. Which component and in what quantity will crystallize if 1 kg of melt containing 10% Pb at 650 K is cooled to 520 K?
7. Calculate the heat of crystallization of Mg.

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