a. Is the combustion of octane a source or sink of a GHG? Explain. b. Write and balance the chemical equation for the combustion of octane c. Calculate the mass of carbon dioxide produced from the complete combustion of 1.0 gallon of gasoline, assuming the fuel is only octane. • Things to think
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.
Octane, C8H18, can be used as a representative compound for gasoline.
a. Is the combustion of octane a source or sink of a GHG? Explain.
b. Write and balance the chemical equation for the combustion of octane
c. Calculate the mass of carbon dioxide produced from the complete
combustion of 1.0 gallon of gasoline, assuming the fuel is only octane.
• Things to think about: How will you start this problem? Notice that you
are not given grams initially, you are given 1.0 gallon. What conversion
will you use to get between gallons and grams? There are 3.785 liters
in a gallon. Use 0.703 g/mL as the density of octane.
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