Limiting Reactant

Question 1

Non-stoichiometric reactant amounts

Answer 1

• When you have less or more of a reactant left over
• Left over amounts do not react as they have nothing to react with
• You can only have one limiting reactant
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Question 2

Mass instead of moles were given: Limiting reactant

Answer 2

• Limiting reactants are based of moles not mass
• Write: If the __ was used up, how much __ would you need?
• After finding limiting reactant, you can find amount of product produced
• Excess reactant has left over that is not going to react, meaning you product is not being produced

Question 3

Steps to solve a stoichiometry problem

Answer 3

STEP 1:
Convert masses to moles
- Be sure to calculate M values using periodic table
Step 2
- Determine how much of reactant B you would need to completely use up reactant A
- If you don’t have that much B, then B is the limiting reactant.
- If you have more than that amount of B, then A is the limiting reactant.
Step 3
Use moles of limiting reactant to find moles of product
- Use mole ratios from chemical equation to convert from moles of the limiting reactant to moles of the desired product
Step 4
- Convert moles of product to mass of product