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Explain the working principle of constant volume and constant pressure calorimeters.

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Answer:

A constant-pressure calorimeter measures the change in enthalpy of a reaction occurring in a liquid solution. ... The heat transferred to/from the solution in order for the reaction to occur is equal to the change in enthalpy (ΔH=qP Δ H = q P ), and a constant-pressure calorimeter thus measures this heat of reaction.