The amount of heat measured for a reaction in a bomb calorimeter corresponds to

Options

A. `DeltaG`
B. `DeltaH`
C. `DeltaU`
D. `P DeltaV`.

Explanation

To solve the question regarding the amount of heat measured for a reaction in a bomb calorimeter, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Calorimeter Types**:
- There are two main types of calorimeters: the bomb calorimeter and the coffee cup calorimeter. Each serves a different purpose in measuring heat changes during chemical reactions.

2. **Function of Bomb Calorimeter**:
- The bomb calorimeter is specifically designed to measure the heat of combustion reactions at constant volume. It is a strong, sealed container that can withstand high pressures.

3. **Heat Measurement in Bomb Calorimeter**:
- In a bomb calorimeter, the heat measured corresponds to the change in internal energy (ΔU) of the system. This is because the reaction occurs at constant volume, and thus, we focus on internal energy changes rather than enthalpy changes.

4. **Formula for Internal Energy Change**:
- The internal energy change can be calculated using the formula:
\[ \Delta U = Q \cdot \Delta T \cdot \frac{m}{M} \]
where:
- \(Q\) = heat capacity of the calorimeter,
- \(\Delta T\) = change in temperature,
- \(m\) = mass of the substance,
- \(M\) = molecular mass of the substance.

5. **Conclusion**:
- Since the bomb calorimeter measures the change in internal energy (ΔU), the correct answer to the question is ΔU.

### Final Answer:
The amount of heat measured for a reaction in a bomb calorimeter corresponds to ΔU (the change in internal energy).

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