Ferrocene, Fe(C5H5)2(s), can be prepared by reacting 3.0 g of FeCl2(s) with an equal mass of cyclopentadiene, C5H6(l), and an excess of KOH, as shown in the following reaction FeCl2 + 2C5H6 + 2KOH → FeC10H10 + 2H2O a. What is the limiting reagent in this procedure? b. Based on your answer to part A, what mass of Fe(C5H5)2 could theoretically be formed?
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.
Ferrocene, Fe(C5H5)2(s), can be prepared by reacting 3.0 g of FeCl2(s) with an
equal mass of cyclopentadiene, C5H6(l), and an excess of KOH, as shown in the
following reaction
FeCl2 + 2C5H6 + 2KOH → FeC10H10 + 2H2O
a. What is the limiting reagent in this procedure?
b. Based on your answer to part A, what mass of Fe(C5H5)2 could
theoretically be formed?
c. A student who carried out this reaction obtained 2.7 g of ferrocene. What
was the percent yield for this reaction?
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