DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction. 2 C6H5Cl + C2HOCl3 → C14H9Cl5 + H2O chlorobenzene chloral DDT In a government lab, 1169 g of chlorobenzene is reacted with 528 g of chloral. (a) What mass of DDT is formed, assuming 100% yield? g (b) Which reactant is limiting? C6H5Cl C2HOCl3 neither reactant is limiting Which is in excess? C6H5Cl C2HOCl3 neither reactant is in excess (c) What mass of the excess reactant is left over? g (d) If the actual yield of DDT is 188.2 g, what is the percent yield? %
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.
DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction.
| 2 C6H5Cl | + | C2HOCl3 | → | C14H9Cl5 | + | H2O |
| chlorobenzene | chloral | DDT |
In a government lab, 1169 g of chlorobenzene is reacted with 528 g of chloral.
g
(b) Which reactant is limiting?
Which is in excess?
(c) What mass of the excess reactant is left over?
g
(d) If the actual yield of DDT is 188.2 g, what is the percent yield?
%
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