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Chapter 7: Problem 63

Explain why it is important for combustion analysis to be carried out in an excess of oxygen.

Short Answer

Expert verified
Answer: It is important to carry out combustion analysis in an excess of oxygen to ensure complete combustion, minimize the production of harmful by-products such as carbon monoxide, and maximize the energy released from the reaction. Adequate oxygen supply results in safer and more efficient combustion processes essential for various industries and energy production systems.

Step by step solution

01

Background on Combustion Reactions

Combustion reactions are chemical reactions that involve the combination of a fuel and an oxidizer, usually oxygen, to produce energy and chemical products. The most common type of combustion reaction is the burning of hydrocarbon fuels, such as gasoline or natural gas, which produce carbon dioxide (CO2) and water (H2O) as products.
02

Complete Combustion

In a complete combustion reaction, all the reactants (fuel and oxygen) are used up completely and only the desired products are formed, which are typically carbon dioxide, water, and heat. The presence of sufficient oxygen molecules ensures that complete combustion takes place, ensuring maximum energy output and only producing the desired products.
03

Incomplete Combustion

Incomplete combustion occurs when there is an insufficient supply of oxygen for the fuel to react completely. In such cases, the combustion reaction produces undesirable products, such as carbon monoxide (CO) and sometimes even elemental carbon (C) in addition to the expected carbon dioxide and water. The presence of carbon monoxide is especially dangerous since it is a toxic gas that can lead to respiratory problems and even death in high concentrations.
04

Importance of Excess Oxygen

Carrying out combustion analysis in an excess of oxygen is important because it ensures that complete combustion takes place. By providing more oxygen than needed for the reaction, there is a higher probability that all the fuel molecules will react completely with the available oxygen molecules, minimizing the production of undesirable and potentially dangerous by-products like carbon monoxide. Furthermore, complete combustion in the presence of excess oxygen guarantees the highest possible energy efficiency from the reaction, which is vital for various industrial processes and energy production.
05

Conclusion

It is important for combustion analysis to be carried out in an excess of oxygen in order to ensure complete combustion. This minimizes the production of undesirable and harmful by-products, such as carbon monoxide, and maximizes the energy released from the reaction. Having adequate oxygen supply results in safer and more efficient combustion processes that are essential to many industries and energy production systems.

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Most popular questions from this chapter

You are given a \(0.6240 \mathrm{g}\) sample of a substance with the generic formula \(\mathrm{MCl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O} .\) After completely drying the sample (which means removing the 2 mol of \(\mathrm{H}_{2} \mathrm{O}\) per mole of \(\mathrm{MCl}_{2}\), , the sample has a mass of \(0.5471 \mathrm{g}\). What is the identity of element M?

Phosgenite, a lead compound with the formula \(\mathrm{Pb}_{2} \mathrm{Cl}_{2} \mathrm{CO}_{3}\) is found in Egyptian cosmetics. Phosgenite was prepared by the reaction of \(\mathrm{PbO}, \mathrm{NaCl},\) and \(\mathrm{CO}_{2} .\) An unbalanced expression of the reactant mixture is $$\mathrm{PbO}(s)+\mathrm{NaCl}(a q)+\mathrm{H}_{2} \mathrm{O}(\ell)+\mathrm{CO}_{2}(g) \rightarrow $$ $$\quad\quad\quad\quad\quad \mathrm{Pb}_{2} \mathrm{Cl}_{2} \mathrm{CO}_{3}(s)+\mathrm{NaOH}(a q)$$ a. Balance the equation. b. How many grams of phosgenite can be obtained from \(10.0 \mathrm{g} \mathrm{PbO}\) and \(10.0 \mathrm{g} \mathrm{NaCl}\) in the presence of excess water and \(\mathrm{CO}_{2} ?\) c. Phosgenite can be considered a mixture of two lead compounds. Which compounds appear to be combined to make phosgenite?

Complete and balance the following chemical equations for the complete combustion of several hydrocarbons. a. \(\mathrm{C}_{3} \mathrm{H}_{8}(g)+\mathrm{O}_{2}(g) \rightarrow\) b. \(\mathrm{C}_{4} \mathrm{H}_{10}(g)+\mathrm{O}_{2}(g) \rightarrow\) c. \(C_{6} H_{6}(\ell)+O_{2}(g) \rightarrow\) d. \(\mathrm{C}_{8} \mathrm{H}_{18}(\ell)+\mathrm{O}_{2}(g) \rightarrow\)

Land Management It has been estimated that better management of cropland, grazing land, and forests could reduce the amount of carbon dioxide in the atmosphere by \(5.4 \times 10^{9}\) kilograms of carbon per year. a. How many moles of carbon are present in \(5.4 \times 10^{9}\) kilograms of carbon? b. How many kilograms of carbon dioxide does this quantity of carbon represent?

Depending on reaction conditions, \(\mathrm{O}_{2}\) may combine with \(\mathrm{N}_{2}\) to form \(\mathrm{NO}\) or \(\mathrm{NO}_{2} .\) If \(x\) grams of \(\mathrm{O}_{2}\) combine with \(y\) grams of \(\mathrm{N}_{2}\) to form \(\mathrm{NO}\), how many grams of \(\mathrm{O}_{2}\) combine with \(y\) grams of \(\mathrm{N}_{2}\) to form \(\mathrm{NO}_{2} ?\)
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