Acetic acid (CH3CO2H), whose aqueous solutions are known as vinegar, is prepared by reaction of ethyl alcohol (CH3CH2OH) with oxygen: CH3CH2OH(l)+O2(g)→CH3CO2H(l)+H2O(l) Use the following data to calculate ΔH∘ in kilojoules for the reaction: ΔH∘f[CH3CH2OH(l)]=−277.7 kJ/mol ΔH∘f[CH3CO2H(l)]=−484.5 kJ/mol ΔH∘f[H2O(l)]=−285.8 kJ/mol Express answer using one decimal place.
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.
Acetic acid (CH3CO2H), whose aqueous solutions are known as vinegar, is prepared by reaction of ethyl alcohol (CH3CH2OH) with oxygen:
CH3CH2OH(l)+O2(g)→CH3CO2H(l)+H2O(l)
ΔH∘f[CH3CH2OH(l)]=−277.7 kJ/mol
ΔH∘f[CH3CO2H(l)]=−484.5 kJ/mol
ΔH∘f[H2O(l)]=−285.8 kJ/mol
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
