A piece of iron with a total surface area of 516 in2 is covered with a solid 0.205 mm coating of Fe2O3, commonly known as “rust”. The reaction of 1 mol of Fe2O3 with 6 mol of HCl(aq) produces 2 mol of FeCl3(aq) and 3 mol of H2O(l). Once rust reacts to form FeCl3(aq) it is essentially removed from the surface of the metal. Rust (Fe2O3) has a density of 5.2 g/cm3 and the HCl(aq) solution used has a density of 1.07 g/mL and contains 14% HCl by mass (i.e., mass HCl per mass of solution expressed as a percent). How many mL of the aqueous HCl solution do you need to clean off all the rust from the piece of iron?
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.
A piece of iron with a total surface area of 516 in2 is covered with a solid 0.205 mm coating of
Fe2O3, commonly known as “rust”. The reaction of 1 mol of Fe2O3 with 6 mol of HCl(aq) produces 2
mol of FeCl3(aq) and 3 mol of H2O(l). Once rust reacts to form FeCl3(aq) it is essentially removed from
the surface of the metal. Rust (Fe2O3) has a density of 5.2 g/cm3 and the HCl(aq) solution used has a
density of 1.07 g/mL and contains 14% HCl by mass (i.e., mass HCl per mass of solution expressed
as a percent). How many mL of the aqueous HCl solution do you need to clean off all the rust from
the piece of iron?
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A piece of iron with a total surface area of 516 in2 is covered with a solid 0.205 mm coating of
Fe2O3, commonly known as “rust”. The reaction of 1 mol of Fe2O3 with 6 mol of HCl(aq) produces 2
mol of FeCl3(aq) and 3 mol of H2O(l). Once rust reacts to form FeCl3(aq) it is essentially removed from
the surface of the metal. Rust (Fe2O3) has a density of 5.2 g/cm3 and the HCl(aq) solution used has a
density of 1.07 g/mL and contains 14% HCl by mass (i.e., mass HCl per mass of solution expressed
as a percent). How many mL of the aqueous HCl solution do you need to clean off all the rust from
the piece of iron?
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