Which device is commonly used to measure heat transfer during chemical reactions at constant pressure?

• A. Coffee-cup calorimeter
• B. Manometer
• C. Bomb calorimeter
• D. Spectrophotometer

Answer: (A)

Verified step by step guidance

1. Understand that measuring heat transfer during chemical reactions often involves calorimetry, which is the science of measuring heat changes.
2. Recognize that the question specifies constant pressure conditions, which is important because different calorimeters operate under different conditions.
3. Recall that a coffee-cup calorimeter is designed to measure heat changes at constant pressure, typically using a simple insulated container like a styrofoam cup.
4. Note that a bomb calorimeter operates at constant volume, not constant pressure, so it is not the correct choice here.
5. Conclude that the coffee-cup calorimeter is the device commonly used to measure heat transfer during chemical reactions at constant pressure.