Answer :
When a reaction's heat is calculated under constant pressure, it equals the enthalpy change. At constant volume or constant pressure, a chemical reaction produces an enthalpy change, which is a heat change.
Enthalpy change indicates how much heat was absorbed or released during the reaction. It is shown by the H. Franklin Electric Sub drive series of constant constant pressure systems, which adjust the pump's speed to suit changing water demand while maintaining constant pressure throughout the system. In sub drive systems, a pressure sensor measures the water pressure, transmits a controller, and controls the pump's speed. Although no work is done when a reaction is conducted in a bomb calorimeter at constant volume, the pressure inside the calorimeter may change.
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