A constant volume calorimetry experiment involves measuring the heat transferred from a "bomb" (with constant volume) to surrounding water. Imagine a scenario where 1.5 mol of a substance is added to the bomb, which causes 525 J of heat to be released into to the surrounding water. The water warms up by 15 K. Treat the substance as the system and the water as the surroundings. a. Is enthalpy or internal energy being measured in this experiment? Provide an explanation to support your answer. b. What is the sign of q of the system? Provide an explanation based on the 1st Law of Thermodynamics to support your answer. c. Calculate the heat capacity at constant volume of the substance based on the information given above.
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.
A constant volume calorimetry experiment involves measuring the heat transferred from a "bomb" (with constant volume) to surrounding water. Imagine a scenario where 1.5 mol of a substance is added to the bomb, which causes 525 J of heat to be released into to the surrounding water. The water warms up by 15 K. Treat the substance as the system and the water as the surroundings.
a. Is enthalpy or internal energy being measured in this experiment? Provide an explanation to support your answer.
b. What is the sign of q of the system? Provide an explanation based on the 1st Law of
c. Calculate the heat capacity at constant volume of the substance based on the information given above.
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