Stoichiometry Practice

Grams to Moles

100

30 grams of H₃PO₄

.31 moles 

200

25 grams of HF 

1.25

300

110 grams of NaHCO₃

1.31 moles

400

1.1 grams of FeCl₃

.0068 moles

500

987 grams of Ra(OH)₂

3.80 moles

Moles Ratio

100

CH₄ + 2O₂ -> Co₂ + 2H₂0

Methane to Carbon dioxide

1:1 

200

C₄H₉OH + 6O₂ -> 4 CO₂ + 5H₂O

Water to oxygen

5:6

300

C₄H₉OH + 6O₂ -> 4 CO₂ + 5H₂O

Oxygen to carbon dioxide 

3:2

400

3H₂SO₄ + 2 Al(OH)₃ -> Al₂(S0₄)₃ + 6H₂O

sulfuric acid to aluminum hydroxide 

3:2 

500

3H₂SO₄ + 2 Al(OH)₃ -> Al₂(SO₄)₃ + 6H₂O

Aluminum hydroxide to water to aluminum sulfate

2:6:1

Moles to Moles

100

N₂ + 3H₂ → 2NH₃ How many moles of hydrogen, H₂, are needed to react with 2.0 moles of nitrogen, N₂? 

6. 0

200

2KClO₃ → 2KCl + 3O₂

How many moles of oxygen are produced by the decomposition of 6.0 moles of potassium chlorate?

9 moles 

300

Zn + 2HCl → ZnCl₂ + H₂

 

How many moles of hydrogen are produced from the reaction of 3.0 moles of zinc with an excess of hydrochloric acid?

3 moles 

400

C₃H₈ + 3O₂ → 3CO₂ + 4H₂

 

How many moles of oxygen are necessary to react completely with 4.0 moles of propane (C₃H₈)?

12 moles 

500

K₃PO₄ + Al(NO₃)₃ → 3KNO₃ + AlPO₄

How many moles of potassium nitrate are produced when 2.5 moles of potassium phosphate react?

7.5 moles

Balancing

100

 H₃PO₄ +  KOH -> K₃PO₄ +  H₂O

1:3:1:3

200

__ K + ___ B₂O₃ ->__ K₂O + ___ B

6:1:3:2

300

__ NH₄OH + ___ H₃PO₄ -> ___ (NH₄)₃PO₄ + ___ H₂O

3:1:1:3

400

___ H₃PO₄ + ___ Ca(OH)₂ -> ___ Ca₃(PO₄)₂ + ___ H₂O

2:3:1:6

500

Ca₃(PO₄)₂ + SiO₂ +  C -> CaSiO₃ + CO +  P

1:3:5:3:5:2

Grams to Grams

100

2C₄H₁₀ + 13 O₂ -> 8 CO₂ + 10 H₂O  How many grams of CO₂ are produced from the combustion of 100. grams of butane?

303

200

C₄H₁₀ + 13 O₂ _> 8 CO₂ + 10 H₂O  

How many grams of O₂ are needed to react with of 100. grams of butane?

358

300

C₄H₁₀ + 13 O₂ _> 8 CO₂ + 10 H₂O   

How many grams of H₂O are produced when 5.38g of O₂ is reacted?

2.33

400

2 KClO₃-> 2 KCl + 3 O₂

How many grams of O2 will be formed from 3.76 grams of KClO3?  

1.47

500

2 KClO₃ ->2 KCl + 3 O₂

How many grams of KClO3 are needed to make 30.0 grams of KCl?  

49.3