Having just invented a new type of calorimeter, Dr. Covey needs to determine the heat capacity of the calorimeter. She carries out the following experiment to do this: Her empty calorimeter is at a temperature of 25.0ºC. She adds 56.439 grams of water at a temperature of 65.6ºC to the empty calorimeter and the final temperature of the calorimeter and the water is 40ºC. Based on this experiment, what is the heat capacity of her calorimeter assuming units of J/ºC? Enter your answer with at least 3 sig figs.
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.
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Having just invented a new type of calorimeter, Dr. Covey needs to determine the heat capacity of the calorimeter. She carries out the following experiment to do this:
Her empty calorimeter is at a temperature of 25.0ºC. She adds 56.439 grams of water at a temperature of 65.6ºC to the empty calorimeter and the final temperature of the calorimeter and the water is 40ºC.
Based on this experiment, what is the heat capacity of her calorimeter assuming units of J/ºC?
Enter your answer with at least 3 sig figs.
Mass of water (m) = 56.439 g
Specific heat capacity of water (s) = 4.18 J/goC
Initial temperature of water = 65.6oC
Final temperature of water = 40oC
Change in temperature of water = 65.6 – 40 = 25.6oC
Amount of heat lost by water = Q = ms∆T
The value of Q can be determined as follows:
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