Hydrogen and methanol have both been proposed as alternatives tohydrocarbon fuels. Write balanced reactions for the completecombustion of hydrogen and methanol and use standard enthalpiesof formation to calculate the amount of heat released per kilogramof the fuel. Which fuel contains the most energy in the least mass?How does the energy of these fuels compare to that of octane(C8H18)?
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.
Hydrogen and methanol have both been proposed as alternatives to
hydrocarbon fuels. Write balanced reactions for the complete
combustion of hydrogen and methanol and use standard enthalpies
of formation to calculate the amount of heat released per kilogram
of the fuel. Which fuel contains the most energy in the least mass?
How does the energy of these fuels compare to that of octane
(C8H18)?
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