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Calorimeters are isolated systems because they are used to determine the heat capacities of substances, so no heat can be lost. Therefore, in calorimeters, it would be implied that the change in internal energy is equal to work since the change in heat is zero.
Calorimeters are isolated systems. that is why you can calculate the final temperature of water inside a calorimeter based on the mass of calorimeter and water and their heat capacities. The heat lost by the calorimeter is absorbed by water since the water is an isolated system and no heat is lost to surroundings
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