Combustion and Stoichiometry Concepts

This video tutorial explores the combustion of methane, focusing on complete and partial combustion reactions. It explains the process of setting up a reactor with a basis of 100 moles of methane and 25% excess air. The tutorial guides viewers through calculating the moles of air fed to the reactor and the moles of each component in the stack gas using molecular species balance. It emphasizes the importance of a fully labeled process diagram and demonstrates how to apply stoichiometry and the extent of reaction to find the flow rates of carbon dioxide, water, oxygen, and nitrogen.

What is the main component of natural gas that is used in the combustion reaction example?

• Ethane

• Propane

• Butane

• Methane

In complete combustion of methane, what is the carbon converted into?

• Carbon dioxide

• Ethanol

• Carbon monoxide

• Methanol

What is the assumed basis for the moles of methane fed to the reactor?

• 200 moles

• 150 moles

• 100 moles

• 50 moles

What percentage of excess air is fed to the reactor in the given example?

• 25%

• 10%

• 15%

• 20%

What is the composition of air by mole percentage in terms of oxygen and nitrogen?

• 21% oxygen, 79% nitrogen

• 79% oxygen, 21% nitrogen

• 50% oxygen, 50% nitrogen

• 60% oxygen, 40% nitrogen

How many moles of oxygen are required to completely consume 100 moles of methane?

• 250 moles

• 100 moles

• 150 moles

• 200 moles

What is the theoretical amount of air required to supply 200 moles of oxygen?

• 800 moles

• 1000 moles

• 900 moles

• 952 moles

How many moles of air are actually fed to the reactor considering the 25% excess?

• 1000 moles

• 1100 moles

• 1300 moles

• 1190 moles

What is the stoichiometric coefficient for methane in the molecular species balance?

• +1

• -1

• +2

• -2

How many moles of nitrogen are found in the output stack gas?

• 1000 moles

• 940 moles

• 900 moles

• 800 moles