Dr. Paul Moses 15.1 Calorimetry Concept Worksheet Calorimetry is used to determine the heat of reactions. In the process, the reaction is carried out in an insulated calorimeter, usually containing a certain volume/weight of water. The increase or decrease in temperature of the water is measured. The change in temperature can be converted to heat that the reaction released (exothermic, temperature increases) or gained (endothermic, temperature decreases). The number of moles of reaction is calculated from the quantity of reacting components. The heat divided by the moles of reaction gives the numerical value of ΔH. The sign of ΔH is determined by the convention, negative for exothermic and positive for endothermic. In some problems, the heat gained by the calorimeter needs to be included in the total heat. To do this, a calorimeter heat constant is measured in a separate experiment in which hot water is added to a calorimeter containing cold water. The hot water gives up heat to the cold
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