Ethanol (C2H5OH) is blended with gasoline as an automobilefuel. (a) Write a balanced equation for the combustionof liquid ethanol in air. (b) Calculate the standard enthalpychange for the reaction, assuming H2O(g) as a product.(c) Calculate the heat produced per liter of ethanol by combustionof ethanol under constant pressure. Ethanol has adensity of 0.789 g/mL. (d) Calculate the mass of CO2 producedper kJ of heat emitted.
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.
Ethanol (C2H5OH) is blended with gasoline as an automobile
fuel. (a) Write a balanced equation for the combustion
of liquid ethanol in air. (b) Calculate the standard enthalpy
change for the reaction, assuming H2O(g) as a product.
(c) Calculate the heat produced per liter of ethanol by combustion
of ethanol under constant pressure. Ethanol has a
density of 0.789 g/mL. (d) Calculate the mass of CO2 produced
per kJ of heat emitted.
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