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7-68 A 50-kg iron block and a 20-kg copper block, both initially at 80C, are dropped into a large lake at 15C. Ther- mal

7-68 A 50-kg iron block and a 20-kg copper block, both initially at 80C, are dropped into a large lake at 15C. Ther- mal equilibrium is established after a while as a result of heat transfer between the blocks and the lake water. Determine the total entropy change for this process. A Stotal = 0.670kJ/K IRON 50 kg LAKE 15C COPPER 20 kg FIGURE P7-68

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