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Explain how heat absorbed at constant pressure is measured using coffee cup calorimeter with neat diagrani.

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1. Measurement of heat change at constant pressure can be done in a coffee cup calorimeter.

2. We know that ∆H = qp (at constant P) and therefore, heat absorbed or evolved, qp at constant pressure is also called the heat of reaction or enthalpy of reaction, ∆Hr

3. in an exoihermic reaction, heat is evolved, and system loses heat to the surroundings. 

Therefore, qp will be negative and ∆Hr will also be negative.

4. Similarly in an endothermic reaction, heat is absorbed, qp is positive and ∆Hr will also be positive.

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