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When a bomb calorimeter is used to determine the heat of reaction, which property of the system under investigation is most likely to remain constant?

1. Number of molecules
2. Pressure
3. Temperature
4. volume

Correct answer: volume

Solution

A bomb calorimeter is sealed and rigid, so the reaction occurs at constant volume. Because the container cannot expand, the system’s volume stays fixed while heat flow is measured from the temperature change of the surroundings.

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