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80 kg iron horseshoe is taken from a furnace at 870C and dropped into 3.00 kg of water at 15.

A 0.80 kg iron horseshoe is taken from a furnace at 870°C and dropped into 3.00 kg of water at 15.0°C. Assuming that no energy is lost by heat to the surroundings, determine the total entropy change of the horseshoe-plus-water system.

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