A student obtained a clean flask. She weighed the flask and stopper on an analytical balance and found the total mass to be 22.534 g. She then filled the flask with water and found the new mass to be 49.379 g. The temperature of the water was measured to be 21°C. Use this data to find the internal volume of the stoppered flask. The density of water at various temperatures is given in Appendix H. Show all calculations necessary to answer the following questions. First calculate the mass of the water in the flask: Mass of water = mass of filled flask – mass of empty flask 1. Mass of water =
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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