Assume you have 1kg of an alloy consisting of 85 wt% Sn and 15 wt% Pb at a temperature of 184 °C. How much Sn (in kg) needs to be added to solidify the entire mixture without lowering the temperature?

Elements Of Electromagnetics
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Publisher:Sadiku, Matthew N. O.
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The question is the image, and could you explain to me how to get the answer because the teacher never discusssed this type of exercise in class and i don't know the proccess of solving it 

6. Assume you have 1kg of an alloy consisting of 85 wt% Sn and 15 wt% Pb at a temperature of 184
°C. How much Sn (in kg) needs to be added to solidify the entire mixture without lowering the
temperature?
Composition (at % Sn)
20
40
60
80
100
327°C
Temperature (°C)
300
200
100
(Pb)
a + L
18.3
20
183°C
a + B
Liquid
61.9
40
60
Composition (wt% Sn)
B+L
80
232°C
97.8
600
500
400
300
200
100
100
(Sn)
Temperature (°F)
Transcribed Image Text:6. Assume you have 1kg of an alloy consisting of 85 wt% Sn and 15 wt% Pb at a temperature of 184 °C. How much Sn (in kg) needs to be added to solidify the entire mixture without lowering the temperature? Composition (at % Sn) 20 40 60 80 100 327°C Temperature (°C) 300 200 100 (Pb) a + L 18.3 20 183°C a + B Liquid 61.9 40 60 Composition (wt% Sn) B+L 80 232°C 97.8 600 500 400 300 200 100 100 (Sn) Temperature (°F)
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