6.6 Limiting reagents

Question 1

What is the limiting reagent

Answer 1

The limiting reagent is the reactant that runs out, it determines the amount of products produced

Question 2

What reagent is in excess

Answer 2

The reactant that doesn’t run out is said to be in excess

Question 3

What are the steps of dealing with limiting reagent calculations

Answer 3

1.Identify the problem and map out a plan

2.Write a balanced equation for the reaction

3.Make an ICF chart and find the moles ofALLchemicals given

4.Use mole ratios to determine limiting reactant

5.Use mole ratios from the limiting reactant to determine the moles of the desired chemical

6.Make any other conversions as required and check

Question 4

What is percent yield

Answer 4

The percent yield is a measure of how much product was actually obtained in an experiment compared to how much was predicted to be made

Question 5

What two yields are involved in percent yield calculations

Answer 5

The theoretical yield is the amount of a product that would be obtained assuming perfect conditions i.e. the quantity predicted from your stoichiometry calculation. The actual yield is the amount that is physically obtained in experiment

Question 6

What’s the formula for percent yield

Answer 6

percent yield = ( actual yield / theoretical yield ) x 100%