7.5 g aluminum was heated with sodium chlorate (NaClO3) in an evacuated glass vessel. The heating resulted in decomposition of NaClO3 and oxygen generated from this reaction converted some of the Al to Al2O3. The combined mass of Al and Al2O3 obtained was 10.7 g. a. Write the balanced equations for decomposition of NaClO3 and formation of Al2O3. b. Calculate the mass of Al2O3 formed and Al remained unreacted. c. Calculate the mass of NaClO3 decomposed.
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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