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.
Three common hydrocarbons that contain four carbons
are listed here, along with their standard enthalpies of
formation:
(a) For each of these substances, calculate the molar enthalpy
of combustion to CO2(g) and H2O(l). (b) Calculate
the fuel value, in kJ/g, for each of these compounds. (c) For
each hydrocarbon, determine the percentage of hydrogen
by mass. (d) By comparing your answers for parts (b) and (c),
propose a relationship between hydrogen content and fuel
value in hydrocarbons.
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