Ozone, O31g2, is a form of elemental oxygen that plays an importantrole in the absorption of ultraviolet radiation in thestratosphere. It decomposes to O21g2 at room temperatureand pressure according to the following reaction:2 O31g2 ¡ 3 O21g2 ΔH = -284.6 kJ(a) What is the enthalpy change for this reaction per moleof O31g2?(b) Which has the higher enthalpy under these conditions,2 O31g2 or 3 O21g2?
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.
Ozone, O31g2, is a form of elemental oxygen that plays an important
role in the absorption of ultraviolet radiation in the
stratosphere. It decomposes to O21g2 at room temperature
and pressure according to the following reaction:
2 O31g2 ¡ 3 O21g2 ΔH = -284.6 kJ
(a) What is the enthalpy change for this reaction per mole
of O31g2?
(b) Which has the higher enthalpy under these conditions,
2 O31g2 or 3 O21g2?
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