Constant - Constant-Pressure Calorimetry Recall that H is...

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Constant-Pressure Calorimetry Recall that H is defined as the quantity of heat transferred under constant pressure ( H = q p ). A calorimeter for such measurements would have the following general construction: Note that the pressure regulator could be just a vent to allow the pressure to be maintained at atmospheric pressure For reactions which involve dilute aqueous solutions, the specific heat of the solution will be approximately that of water (4.18 J g -1 K -1 ) The heat absorbed by an aqueous solvent is equal to the heat given off by the reaction of the solutes: q aq solvent = -q rxn Remember: If a reaction gives off heat, it is exothermic and H is negative . The enthalpy of the products is less than the enthalpy of the reactants H = H products -H reactants In our calorimeter with an aqueous solution, if the reaction of the solutes is exothermic, the solution will absorb this heat and increase in temperature.
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Constant - Constant-Pressure Calorimetry Recall that H is...

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