Limiting Reactants in Chemical Reactions

This video tutorial by Dr. B explains how to identify the limiting reactant in a chemical reaction. It covers the concept of limiting reactants, using both 1:1 and 1:3 ratios as examples. The tutorial includes step-by-step calculations and a practice problem to reinforce learning. The video concludes with a summary of the key points discussed.

What is the limiting reactant in a reaction with a 1:1 ratio if you have 5 moles of A and 3 moles of B?

• B

• Neither

• A

• Both A and B

In a reaction with a 1:3 ratio, if you have 3 moles of A and 9 moles of B, which is the limiting reactant?

• A

• Both A and B

• B

• Neither

How do you determine the limiting reactant when given a 1:3 ratio?

• Compare the number of moles directly

• Divide the number of moles by the coefficient

• Multiply the number of moles by the coefficient

• Subtract the smaller number of moles from the larger

If you have 1.8 moles of A and 2.1 moles of B in a 1:1 ratio, which is the limiting reactant?

• A

• B

• Both A and B

• Neither

In a practice problem, if you have 4 moles of A and 5 moles of B in a 1:1 ratio, which reactant will be used up first?

• Both A and B

• A

• Neither

• B