O 12/10/2015 11:00 PM A 46.2/100 O 12/8/2015 01:26 PM Gradebook Print Calculator

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O 12/10/2015 11:00 PM A 46.2/100 O 12/8/2015 01:26 PM Gradebook Print Calculator Periodic Table Question 3 of 15 ncorrect ncorrect Map A pling You drop a 287-g silver figure of a polar bear into the 223-g aluminum cup of a well-insulated calorimeter containing 275 g of liquid water at 24.9°C. The bears initiartemperature is 96.5°C. What is the final temperature of the water, Cup, and bear when they reach thermal equilibrium? The specific heats of silver, aluminum, and liquid water are, respectively, 234 J/(kg K), 910 J/(kg K), and 4190 J/(kg. K). Number 035 There is a hint available! divider bar again to hide the hint. Close A Previous Give Up & View Solution Check Answer Next Ext O Hint

Explanation / Answer

E =MCT
T = E/(M1C1 + M2C2 +M3C3)

C1 = 234 E1 = 0.287 X 234 X (96.5 +273) = 24815j
C2 = 910 E2 = 0.223 X 910 X (24.9 +273) = 60452.8
C3 = 4190 E3 = 0.275 X 4190 X (24.9+ 273) = 343255.2

E-Total = 24815+ 60452.8 + 343255.2= 428522.4j
M1C1 =71.21
M2C2 = 134.8
M3C3 = 943.95
T = 428522.4/(71.21+134.8+943.95) = 372.64
372.64 = 273 = 99.64 Celsius

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