Chromium metal can be produced from the high temperature reaction of Cr2O3 [chromium(III) oxide] with silicon or aluminum by each of the following reactions: Cr2O3+2Al >>>> 2Cr+Al2O3 2Cr2O3+3Si >>>>>4Cr+3SiO2 Calculate the number of grams of aluminum required to prepare 157.0 g of chromium metal by the first reaction? Calculate the number of grams of silicon required to prepare 157.0 g of chromium metal by the second reaction?
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.
Chromium metal can be produced from the high temperature reaction of Cr2O3 [chromium(III) oxide] with silicon or aluminum by each of the following reactions:
Cr2O3+2Al >>>> 2Cr+Al2O3
2Cr2O3+3Si >>>>>4Cr+3SiO2
Calculate the number of grams of aluminum required to prepare 157.0 g of chromium metal by the first reaction?
Calculate the number of grams of silicon required to prepare 157.0 g of chromium metal by the second reaction?
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