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

This preview shows pages 1–2. Sign up to view the full content.

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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online