Using enthalpies of formation, calculate the standard change in enthalpy for the thermite reaction: 2Al(s) + Fe2O3(s) ⟶ Al2O3(s) + 2Fe(s) This reaction occurs when a mixture of powdered aluminum and iron(III) oxide is ignited with a magnesium fuse. The following enthalpies of formation are known: ΔHºf for Fe2O3(s) = -826 kJ ΔHºf for Al2O3(s) = -1676 kJ
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.
Using enthalpies of formation, calculate the standard change in enthalpy for the thermite reaction:
2Al(s) + Fe2O3(s) ⟶ Al2O3(s) + 2Fe(s)
This reaction occurs when a mixture of powdered aluminum and iron(III) oxide is
ignited with a magnesium fuse. The following enthalpies of formation are known:
ΔHºf for Fe2O3(s) = -826 kJ
ΔHºf for Al2O3(s) = -1676 kJ
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
