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Chrome File Edit View History Bookmarks People Window Help 5 6 2 0 * 0) 75% D Tue 12:29 PM Q := O O O / D Student Schedule - Week at a XXI CHLH 243 | Course Explorer x Y A PHYS 212 SPRING 2018 x XC Chegg Study | Guided Solutio x l Homework: Heat and Tempere X Sam F + C a Secure | https://byteshelf.physics.ilinois.edu/Course/ViewProblem?unititemID=91490&enrollmentID;=64207 4 O O O : E Apps BUIUC b career O Fisomo @ YouTube to mp3 Con... Other Bookmarks Standard Exercise Thermal Solids Heat capacity and T 1 | 2 | 3 Enter here the question setup Standard Exercise Heat capacity and T Standard Exercise Latent heat and S 1) 1.1kg of gold at 300K comes in thermal contact with 2.1kg copper at 400K. What equilibrium temperature do they reach? Ttinal- Standard Exercise Two Glass Blocks K Submit Help Standard Exercise Entropy Change 2) How much does the entropy of the copper change? Stinal-Sinitial = J/K Submit Help 3) How much does the total entropy of the Au-Cu change? J/K Submit Aurinhen annonartment of Dhartre Tinkereliha nf Illinoie st IIrhana.rhamna Almacmillan 9 NOG 9 GP NU

Explanation / Answer

1) we know energy, q = (mass) (t) (Cp)

here t is in celcius

the energy amount going out of the copper is equal to the energy amount going into the gold. This means:

qlost = qgain

Hence, (mass of gold) (x-tgold ) (Cpgold) = (mass of copper) (tcopper- x) (Cpcopper)

1.1*(x-26.85)*0.129 = 2.1*(126.85-x)*0.385

0.95x = 106.36

x = 111.95 celcius

hence equilibrium tempeature is 385 K

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