27. Single-use handwarmers create heat by exposing solid iron filings to atmospheric oxygen to create iron (III) oxide. This is an exothermic reaction that naturally releases heat. a. Write a balanced equation for this reaction. b. If an unexposed handwarmer packet contains 13.0 g of iron filings, what mass of iron (III) oxide would theoretically be produced once the packet is exposed to air and the reaction has been completed? If the actual reaction only has a percent yield of 74%, by how much will the overall mass of the packet change once the reaction is complete? c.
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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