In Brazil automobiles use ethanol, C2 H6 O, as fuel, whereas in the United States we rely on gas

step 1 So the question here basically asks us to write a balance equation for ethanol, C2H60, and one f

In Brazil automobiles use ethanol, C2 H6 O, as fuel, whereas...

In Brazil automobiles use ethanol, $\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O},$ as fuel, whereas in the United States we rely on gasoline. Using $\mathrm{C}_{8} \mathrm{H}_{18}$ (octane) to represent gasoline, write balanced chemical equations for the complete combustion of ethanol and octane. Which fuel produces more $\mathrm{CO}_{2}$ per gram of fuel?

Key Concepts

Combustion Reactions

A combustion reaction is a chemical process where a fuel reacts with an oxidizing agent, typically oxygen, to produce combustion products such as carbon dioxide and water along with energy. In complete combustion, all the carbon in the fuel is oxidized to CO2 and the hydrogen is oxidized to H2O, meaning that the reaction must be carefully balanced to abide by the law of conservation of mass.

Stoichiometry

Stoichiometry involves the quantitative relationships between the reactants and products in a chemical reaction. It enables the calculation of the amounts of substances consumed and produced in a reaction by balancing chemical equations and converting between moles and grams, which is essential for comparing outputs such as the amount of CO2 produced from different fuels.

Balancing Chemical Equations

Balancing chemical equations is the process of ensuring that the number of atoms for each element is the same on both sides of the equation. This is critical in chemical reactions because it adheres to the law of conservation of mass and allows one to correctly predict the amounts of products formed from given reactants.

Mole Concept and Molar Mass

The mole concept provides a means to count particles by relating the mass of a substance to the number of constituent particles using Avogadro's number. Molar mass, the mass of one mole of a substance, is essential when converting between the mass of a fuel and the number of moles of its constituent atoms, which is vital for determining reaction yields and comparing fuel emissions such as CO2 per gram of fuel.

Carbon Content Analysis

Carbon content analysis involves evaluating the number of carbon atoms in a fuel molecule to predict the yield of carbon dioxide upon complete combustion. By comparing the ratio of carbon atoms per gram of fuel, one can assess and compare the potential environmental impact of different fuels in terms of CO2 emissions.

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