5: An iron block of unknown mass at 79 C is dropped into an insulated tank that contains 151 L of water at 22 C. At the

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5 An Iron Block Of Unknown Mass At 79 C Is Dropped Into An Insulated Tank That Contains 151 L Of Water At 22 C At The 1 (43.49 KiB) Viewed 16 times

5: An iron block of unknown mass at 79 C is dropped into an insulated tank that contains 151 L of water at 22 C. At the same time, a paddle wheel driven by 257 W motor is activated to stir water. It is observed that thermal equilibrium is established after 17 minutes with a final temperature of 28 C. Assume the surrounding temperature is 18 C. The density and specific heat of water at 25°C are p = 997 kg/m' and c-4.18 kJ/kgC. The specific heat of iron at room temperature is c = 0.45 kJ/kgC. a. Determine the mass of the iron block. b. Determine the exergy destroyed during the process. Iron Water