Given the combustion of gasoline: 2C8H18 + 25 O2 →16CO2 +18H2O How many moles of O2 is required to react with 4.00 moles of C8H18? Select one: a. 2.00 b. 50.0 c. 25.0 d. 12.5
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.
Given the combustion of gasoline: 2C8H18 + 25 O2 →16CO2 +18H2O
How many moles of O2 is required to react with 4.00 moles of C8H18?
The ratio among various participating substances in reactions is referred as molar ratio. This can be easily derived using the stoichiometry of balanced chemical equation. All those participating compounds react according to this ratio only.
Given:
The number of moles of C8H18 is 4.00 mol.
The given reaction is as follows:
In the above reaction, 2 moles of C8H18 react with 25 moles of O2 and produces 16 moles CO2 and 18 moles of H2O.
The number of moles of oxygen reacted with 4 moles of C8H18 is calculated as shown below.
Thus, the moles of oxygen required are 50.0 mol.
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