The thermite reaction, Fe2O3(s) + 2 Al(s) ---->2 Fe(s) +Al2O3(s), ΔH° = -851.5 kJ/mol, is one of the most exothermicreactions known. Because the heat released issufficient to melt the iron product, the reaction is used toweld metal under the ocean. How much heat is released permole of Al2O3 produced? How does this amount of thermalenergy compare with the energy released when 2 mol ofprotons and 2 mol of neutrons combine to form 1 mol ofalpha particles?
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.
The thermite reaction, Fe2O3(s) + 2 Al(s) ---->2 Fe(s) +
Al2O3(s), ΔH° = -851.5 kJ/mol, is one of the most exothermic
reactions known. Because the heat released is
sufficient to melt the iron product, the reaction is used to
weld metal under the ocean. How much heat is released per
mole of Al2O3 produced? How does this amount of thermal
energy compare with the energy released when 2 mol of
protons and 2 mol of neutrons combine to form 1 mol of
alpha particles?
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 5 images
