Engineering Board Exam Reviewer · Engineering Materials · hard
A Pb–40 wt% Sn alloy at 150 °C consists of (10 wt% Sn) and (98 wt% Sn). What is the mass fraction of the phase?
- 0.341
- 0.400
- 0.659
- 0.306
Answer
C. 0.659
Solution
Lever rule: W = (C - C0)/(C - C ) = (98 - 40)/(98 - 10) = 0.659.
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