Understanding Combustion Reactions and Stoichiometry

What are the products of a combustion reaction involving methane?

• Hydrogen and oxygen

• Methane and oxygen

• Carbon dioxide and water

• Carbon monoxide and water

What is the first step in balancing a chemical equation?

• Calculate the molecular weight

• Convert grams to moles

• Balance the number of atoms on both sides

• Identify the limiting reactant

In the combustion of methane, what is the limiting reactant when oxygen is in excess?

• Methane

• Carbon dioxide

• Oxygen

• Water

How many moles of carbon dioxide are produced from 6.23 moles of methane?

• 9.34 moles

• 6.23 moles

• 3.11 moles

• 12.46 moles

What is the molecular weight of carbon dioxide used in the calculations?

• 28.02 g/mol

• 44.1 g/mol

• 32.00 g/mol

• 18.01 g/mol

What is the mole-to-mole ratio of methane to water in the combustion reaction?

• 3:1

• 2:1

• 1:2

• 1:1

How many grams of water are produced from 12.5 moles of water?

• 18 grams

• 225 grams

• 112.5 grams

• 450 grams

Why is it important to use significant figures in calculations?

• To simplify the chemical equation

• To reduce the number of calculations

• To ensure accuracy and integrity of data

• To make calculations easier

What is the final step in the stoichiometry process described?

• Balance the chemical equation

• Convert moles to grams

• Determine the limiting reactant

• Convert grams to moles

What should you do if your calculated answer differs due to significant figures?

• Recalculate using more significant figures

• Use a different method

• Ignore the difference

• Follow your teacher's guidelines