Limiting Reactants and Molar Mass

The video tutorial explains how to calculate the amount of product formed in a chemical reaction when limiting reactants are involved. It covers the process of setting up calculations for two reactants, ammonia and sodium, and determining which reactant is limiting by comparing the amounts of product formed. The tutorial includes balancing chemical equations, converting grams to moles, and using molar mass for calculations. It concludes with practice questions to reinforce the concepts learned.

What is the primary reason for identifying the limiting reactant in a chemical reaction?

• To determine the amount of excess reactant

• To find out the total mass of reactants

• To calculate the amount of product formed

• To balance the chemical equation

If you have 50 grams of reactant A and 50 grams of reactant B, what should you do to find the limiting reactant?

• Use the molar mass of reactant A only

• Perform two separate calculations and compare the results

• Perform a single calculation for reactant B

• Perform a single calculation for reactant A

What is the first step in setting up calculations for determining the amount of product formed?

• Convert grams of reactants to moles

• Balance the chemical equation

• Calculate the molar mass of the product

• Identify the excess reactant

Why is it important to balance the chemical equation before performing calculations?

• To ensure the correct ratio of reactants to products

• To find the molar mass of reactants

• To determine the limiting reactant

• To convert grams to moles

What is the molar mass of ammonia (NH3)?

• 17.03 g/mol

• 22.99 g/mol

• 39.02 g/mol

• 14.01 g/mol

In the given example, what is the molar mass of sodium metal (Na)?

• 22.99 g/mol

• 39.02 g/mol

• 17.03 g/mol

• 14.01 g/mol

What is the final step in the calculation process to find the amount of product formed?

• Convert grams of reactants to moles

• Balance the chemical equation

• Identify the limiting reactant

• Convert moles of product to grams

How do you determine the limiting reactant after performing the calculations?

• By choosing the reactant with the higher molar mass

• By choosing the reactant that produces less product

• By choosing the reactant with the larger amount

• By choosing the reactant that produces more product

What is the significance of significant figures in the final answer?

• To identify the limiting reactant

• To convert grams to moles

• To balance the chemical equation

• To ensure accuracy in the calculations

In the practice problems, what indicates the excess reactant?

• The reactant with the smaller amount

• The reactant that is completely consumed

• The reactant with the higher molar mass

• The reactant that produces more product