Burning methane in oxygen can produce three differentcarbon-containing products: soot (very fine particles ofgraphite), CO(g), and CO21g2. (a) Write three balanced equationsfor the reaction of methane gas with oxygen to producethese three products. In each case assume that H2O1l2 is theonly other product. (b) Determine the standard enthalpiesfor the reactions in part (a). (c) Why, when the oxygen supplyis adequate, is CO21g2 the predominant carbon-containingproduct of the combustion of methane?
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.
Burning methane in oxygen can produce three different
carbon-containing products: soot (very fine particles of
graphite), CO(g), and CO21g2. (a) Write three balanced equations
for the reaction of methane gas with oxygen to produce
these three products. In each case assume that H2O1l2 is the
only other product. (b) Determine the standard enthalpies
for the reactions in part (a). (c) Why, when the oxygen supply
is adequate, is CO21g2 the predominant carbon-containing
product of the combustion of methane?
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