Portable hot packs are available for skiers and other people engaged in other outdoor activities in a cold climate. The air-permeable paper packet contains a mixture of powdered iron, sodium chloride, and other components, all moistened by a little water. The exothermic reaction that produces the heat is a very common one, the rusting of iron: 4Fe(s) + +30₂(g) 1 kJ When the outside plastic envelope is removed, O₂ molecules penetrate the paper, causing the reaction to begin. A particular packet contains 200. g of iron to warm your hands or feet for up to 4 hours. Calculate the amount of heat (in kJ) associated with this reaction. Be sure your answer has the correct number of significant digits. Note: Reference the Thermodynamic properties of pure substances table for additional information. 2 Fe₂03 (s) X
Portable hot packs are available for skiers and other people engaged in other outdoor activities in a cold climate. The air-permeable paper packet contains a mixture of powdered iron, sodium chloride, and other components, all moistened by a little water. The exothermic reaction that produces the heat is a very common one, the rusting of iron: 4Fe(s) + +30₂(g) 1 kJ When the outside plastic envelope is removed, O₂ molecules penetrate the paper, causing the reaction to begin. A particular packet contains 200. g of iron to warm your hands or feet for up to 4 hours. Calculate the amount of heat (in kJ) associated with this reaction. Be sure your answer has the correct number of significant digits. Note: Reference the Thermodynamic properties of pure substances table for additional information. 2 Fe₂03 (s) X
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
Problem 9.101PAE
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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.
Question
Transcribed Image Text:Portable hot packs are available for skiers and other people engaged in other outdoor activities in a cold climate. The air-permeable paper packet contains a
mixture of powdered iron, sodium chloride, and other components, all moistened by a little water. The exothermic reaction that produces the heat is a very
Common one, the rusting of iron:
4Fe(s) + 30₂(g)
2 Fe₂O3 (s)
When the outside plastic envelope is removed, O₂ molecules penetrate the paper, causing the reaction to begin. A particular packet contains 200. g of iron to
warm your hands or feet for up to 4 hours. Calculate the amount of heat (in kJ) associated with this reaction. Be sure your answer has the correct number of
significant digits.
Note: Reference the Thermodynamic properties of pure substances table for additional information.
kJ
X
S
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