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 andwater react to form acetylene and calcium hydroxide:CaC,(s) + 2 H,O(g9)→ C,H,(9) + Ca(OH),(s)AH=-414. kJIn the second step, acetylene, carbon dioxide and water react to form acrylic acid:6 C,H,(9) + 3 CO,(g) + 4 H,O(g) → 5CH, CHCO,H(9)AH=132. kJCalculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions.Round your answer to the nearest kJ.

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Concept explainers

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.

Question

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:
CaC,(s) + 2 H,O(g9)
→ C,H,(9) + Ca(OH),(s)
AH=-414. kJ
In the second step, acetylene, carbon dioxide and water react to form acrylic acid:
6 C,H,(9) + 3 CO,(g) + 4 H,O(g) → 5
CH, CHCO,H(9)
AH=132. kJ
Calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions.
Round your answer to the nearest kJ.

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