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Question: 

What will be the equilibrium temperature when a 265-g block of copper at $245 ^\circ \textrm{C}$ is placed in a 145-g aluminum calorimeter cup containing 825 g of water at $12.0 ^\circ \textrm{C}$?

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

$18.5^\circ\textrm{C}$

Giancoli 7th Edition, Chapter 14, Problem 14

(4:40)