RPAL Limiting Reagents 3

Question 1

In the reaction Fe + S → FeS, if 2 mol Fe and 3 mol S are present, how many moles of FeS can form?

Accepted Answer

2 mol

Answer

3 mol

Answer

5 mol

Answer

1 mol

Question 2

How many moles of excess reagent remain after the reaction in the previous question (2 mol Fe + 3 mol S → FeS)?

Accepted Answer

1 mol S

Answer

1 mol Fe

Answer

2 mol S

Answer

0 mol — both are consumed

Question 3

Which factor does NOT affect which reactant is the limiting reagent?

Accepted Answer

The temperature of the reaction

Answer

The initial moles of each reactant

Answer

The stoichiometric coefficients in the balanced equation

Answer

The molar masses used to convert grams to moles

Question 4

For 2SO₂ + O₂ → 2SO₃, if 4 mol SO₂ and 1 mol O₂ react, how many moles of SO₃ are produced?

Accepted Answer

2 mol

Answer

4 mol

Answer

1 mol

Answer

3 mol

Question 5

A recipe analogy for limiting reagent: if making sandwiches requires 2 slices of bread and 1 slice of cheese, and you have 10 bread and 4 cheese, what is the 'limiting reagent'?

Accepted Answer

Cheese

Answer

Bread

Answer

Both equally

Answer

Neither

Question 6

After the reaction in the sandwich analogy (10 bread, 4 cheese, 2 bread + 1 cheese per sandwich), how many bread slices are left over?

Accepted Answer

2 slices

Answer

4 slices

Answer

0 slices

Answer

6 slices