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21. The initial temperature of an iron block of unknown mass is 83 oC. The iron...

21. The initial temperature of an iron block of unknown mass is 83 oC. The iron block is cooled by dropping it into an insulated container that contains 73 Liters of water at 23 oC. After reaching thermal equilibrium, the final temperature of the iron block and water is measured as 39 oC.  If the total entropy change for this process is 2.5 kJ/oK, determine the mass of the iron in kg. The specific heat for iron is 0.448 kJ/kg-oK and the specific heat for water is 4.184 kJ/kg-oK. The density of iron is 7840 kg/m3 and the density of water is 1000 kg/m3.

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