In the process of pickling, rust is removed from newly pro-duced steel by washing the steel in hydrochloric acid:(1) 6HCl(aq)+ Fe₂O₃(s)→2FeCl₃(aq) +3H₂O(l) During the process, some iron is lost as well:(2) 2HCl(aq)+ Fe(s)→FeCl₂(aq)+ H₂(g) (a) Which reaction, if either, is a redox process? (b) If reaction 2 did not occur and all the HCl were used, how many grams of Fe₂O₃ could be removed and FeCl₃ produced in a 2.50103-L bath of 3.00 MHCl? (c) If reaction 1 did not occur and all theHCl were used, how many grams of Fe could be lost and FeCl₂ produced in a 2.50103-L bath of 3.00 M HCl? (d) If 0.280 g of Fe is lost per gram of Fe₂O₃ removed, what is the mass ratio of FeCl₂ to FeCl₃?
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.
In the process of pickling, rust is removed from newly pro-duced steel by washing the steel in hydrochloric acid:(1) 6HCl(aq)+ Fe₂O₃(s)→2FeCl₃(aq) +3H₂O(l) During the process, some iron is lost as well:(2) 2HCl(aq)+ Fe(s)→FeCl₂(aq)+ H₂(g) (a) Which reaction, if either, is a redox process? (b) If reaction 2 did not occur and all the HCl were used, how many grams of Fe₂O₃ could be removed and FeCl₃ produced in a 2.50103-L bath of 3.00 MHCl? (c) If reaction 1 did not occur and all theHCl were used, how many grams of Fe could be lost and FeCl₂ produced in a 2.50103-L bath of 3.00 M HCl? (d) If 0.280 g of Fe is lost per gram of Fe₂O₃ removed, what is the mass ratio of FeCl₂ to FeCl₃?
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