There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. In the first step, calcium carbide CaC2 and water react to form acetylene C2H2 and calcium hydroxide: CaC2s + 2H2Og + C2H2g -> CaOH2s In the second step, acetylene C2H2 , carbon dioxide and water react to form acrylic acid
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.
There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. In the first step, calcium carbide
and water react to form acetylene
and calcium hydroxide:
In the second step, acetylene
, carbon dioxide and water react to form acrylic acid
:
Suppose the yield of the first step is
and the yield of the second step is
. Calculate the mass of calcium carbide required to make
of acrylic acid.
Be sure your answer has a unit symbol, if needed, and is rounded to the correct number of significant digits.
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