acity for the calorimeter Ccal by a calibration technique involving mixing hot and room-temperature or cold water in the instrument. Consider two 50.0 mL volumes of water, one at 20.0 °C and the other at 100.0 °C. (a) What are the masses of the volumes of water? (b) The temperature of the combined solutions when mixed in a calorimeter is measured to be 52.4 °C. What are the temperature changes for each of the volumes of water? (c) What are the heat flows for each volume of water, qcold and qhot, in Joules?
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
In order to calculate the total heat flow for a process in the calorimeter, you will need to calculate the heat capacity for the calorimeter Ccal by a calibration technique involving mixing hot and room-temperature or cold water in the instrument. Consider two 50.0 mL volumes of water, one at 20.0 °C and the other at 100.0 °C.
(a) What are the masses of the volumes of water?
(b) The temperature of the combined solutions when mixed in a calorimeter is measured to be 52.4 °C. What are the temperature changes for each of the volumes of water?
(c) What are the heat flows for each volume of water, qcold and qhot, in Joules?
(d) What is the heat flow for the calorimeter itself, qcal in Joules? (e) Assuming the calorimeter underwent the same temperature change as the volume of cold water, what is the value of the calorimeter constant Ccal for this calorimeter?
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