hw_5_solutions

# hw_5_solutions - Homework Thermal Properties and Phase...

This preview shows pages 1–3. Sign up to view the full content.

Homework: Thermal Properties and Phase Diagrams Review Date: 1. What are the eutectic temperature and the eutectic composition? a. Fill in the phases in the missing regions. b. What phases are present at points A, B, C, and D? What is their relative amount? What is their individual composition? What is the overall composition? c. A 100g solid sample is found to have 40g of bismuth by mass at 50°C. How many phases are present in this solid mixture? If more than one, find the composition of each. d. A 100g liquid solution at 250°C is found to have 70g bismuth. Label the point on the diagram. If one wants to remove 30g of bismuth completely, how much would one need to cool the solution? e. What are the melting points of bismuth and tin? Solution:

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
1. Consult diagram where appropriate a. See diagram b. See diagram for tie-lines. Phase Present Composition of each phase [read the intersection of tie line with phase boundaries] Relative amount of each phase A + Bi is 8% bismuth Bi is 100% bismuth Use the tie-line to determine relative distance; see diagram Point A is at 24 Left intersection is at 8 Right intersection is at 100 Overall length=92 Length of left segment = 24-8= 16 Length of right segment = 100-24= 76 Thus: ܤ݅ = ݈݂݁ݐ ݏ݁݃݉݁݊ݐ ݐ݋ݐ݈ܽ ݈݁݊݃ݐℎ = 16 92 = 0.174 = 17.4% ߚ = ௥௜௚௛௧ ௧௢௧௔௟ = ଻଺
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern