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You place a 4.00 kg iron bar (specific heat capacity, C=0.473 J/g °C) in a beaker containing 1.00 kg of water at 23.0 °C (density = 0.998 g/ml, C= 4.184 J/ g °C). After several minutes, the temperature of the water is 28.7°C. What was the final temperature of the iron bar?