Also known as constant-pressure calorimeter. It is a simpler device than the constant volume calorimeter (Bomb Calorimeter), which is used to determine the heat changes for non combustion reactions. A crude constant-pressure calorimeter can be constructed from Styrofoam coffee-cup. This device measures the heat effects of a variety of reactions, such as acid-base neutralization, as well as the heat of solution and heat of dilution. Because the pressure is constant, the heat change for the process (qrxn) is equal to the enthalpy change (ΔH).
A constant-pressure calorimeter measures the change in enthalpy of reaction occurring in solution during which the atmospheric pressure remains constant.
The equation involved in calculation for qrxn
qsys = qsoln + qcal + qrxn
since there's no heat enter or leave from system:
qsys = 0
qrxn = -(qsoln + qcal)
Where:
qsoln = mcΔT
qcal = CcalΔT
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