RPAL Mole Ratios 3

Question 1

For the reaction 2Al + 6HCl → 2AlCl₃ + 3H₂, how many moles of H₂ are produced from 4 mol HCl?

Accepted Answer

2 mol H₂

Answer

3 mol H₂

Answer

4 mol H₂

Answer

6 mol H₂

Question 2

How many moles of Al are needed to produce 1 mol AlCl₃ in 2Al + 6HCl → 2AlCl₃ + 3H₂?

Accepted Answer

1 mol Al

Answer

2 mol Al

Answer

0.5 mol Al

Answer

3 mol Al

Question 3

For 3H₂ + N₂ → 2NH₃, how many moles of N₂ are needed to produce 6 mol NH₃?

Accepted Answer

3 mol N₂

Answer

6 mol N₂

Answer

2 mol N₂

Answer

9 mol N₂

Question 4

Why are mole ratios central to all stoichiometry calculations?

Accepted Answer

They link the quantities of all substances in a reaction through the balanced equation

Answer

They determine the reaction rate

Answer

They predict whether a reaction is exothermic or endothermic

Answer

They define the physical states of reactants and products

Question 5

For C₃H₈ + 5O₂ → 3CO₂ + 4H₂O, what is the mole ratio of C₃H₈ to CO₂?

Accepted Answer

1:3

Answer

3:1

Answer

1:5

Answer

5:3

Question 6

Using C₃H₈ + 5O₂ → 3CO₂ + 4H₂O, how many moles of H₂O form when 2 mol C₃H₈ burns?

Accepted Answer

8 mol H₂O

Answer

4 mol H₂O

Answer

6 mol H₂O

Answer

10 mol H₂O