The thermite reaction was once used to weld rails: 2Al(s) + Fe2O3(s) --> Al2O3(s) 1 2Fe(s) (a) Using heat of formation data, calculate DH for this reaction. (b) Take the specific heats of Al2O3 and Fe to be 0.77 and 0.45 J/g . 0C, respectively. Calculate the temperature to which the products of this reaction will be raised, starting at room temperature, by the heat given off in the reaction. (c) Will the reaction produce molten iron (mp Fe = 15350C, DHfus = 270 J/g)?
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 was once used to weld rails:
2Al(s) + Fe2O3(s) --> Al2O3(s) 1 2Fe(s)
(a) Using heat of formation data, calculate DH for this
reaction.
(b) Take the specific heats of Al2O3 and Fe to be 0.77
and 0.45 J/g . 0C, respectively. Calculate the temperature
to which the products of this reaction will be raised,
starting at room temperature, by the heat given off in the
reaction.
(c) Will the reaction produce molten iron (mp Fe =
15350C, DHfus = 270 J/g)?
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