Stoichiometry

Mole Ratios

100

What is the mole ratio for N₂ to NH₃:

N₂ + 3H₂  → 2NH₃

1:2

200

What is the mole ratio of KClO₃ to KCl?

2KClO₃ → 2KCl + 3O₂

2:2 or 1:1

300

How many moles of hydrogen can be produced from 4 moles of zinc?

Zn + 2HCl → ZnCl₂ + H₂

4 moles

400

How many moles of hydrogen can be produced from 4 moles of hydrochloric acid (HCl)?

Zn + 2HCl → ZnCl₂ + H₂

2 moles

500

How many moles of oxygen are needed to produce 8 moles of hydrogen?

C₃H₈ + 5O₂ → 3CO₂ + 4H₂

10 moles

Stoichiometry

100

What determines the amount of products formed in a chemical reaction?

limiting reactant

200

What the study of the relationships or ratios between two or more substances undergoing a chemical reaction? 

Stoichiometry

300

10 grams of oxygen can be produced in a chemical reaction but only 9.0 grams are recovered in the lab. What is the percent yield?

90%

400

How many grams of aluminum (Al) are needed to form 2.5 mol of hydrogen (H2)? (2 steps)

2Al    +       6HCl  →       2AlCl₃         +       3H₂

45 grams

500

How many grams of water (H₂O) are formed from 75 grams of oxygen (O₂)? (3 steps)

C₆H₁₂O₆   +   6O₂   →   6CO₂   +   6H₂O

42 grams