The conversion of oxygen into ozone in the upper atmosphere is as follow : 3232 O2(g) → O3(g), with ΔH298 = +143kJ at 298K. Cp(O2) = 29.355 J/Kmol; Cp(O3) = 39.2 J/K The enthalpy of formation at 200K is : a. ΔH200 = +142 527J b. ΔH200 = -143 473J c. ΔH200 = +143 473J d. ΔH200 = -142 527J
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.
The conversion of oxygen into ozone in the upper atmosphere is as follow :
3232 O2(g) → O3(g), with ΔH298 = +143kJ at 298K.
Cp(O2) = 29.355 J/Kmol; Cp(O3) = 39.2 J/K
The enthalpy of formation at 200K is :
ΔH200 = +142 527J
ΔH200 = -143 473J
ΔH200 = +143 473J
ΔH200 = -142 527J
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 1 images
