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A coffee cup calorimeter lets heat leak to the room. Its results are therefore:

ALess accurate
BLess costly
CLess visible
DLess crowded
Answer & Solution
Correct answer: A. Less accurate
1. Some heat never reaches the water. 2. The measured value misses that share. 3. So the results are less accurate. _Source: OpenStax Chemistry 2e, Chapter 5, Thermochemistry._
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