Reactions and Stoich Review

Mole Conversions

100

How many Oxygen atoms are in the compound Ca(NO₃)₂

What is 6?

200

What is the molar mass of H₂SO₄?  (include units of molar mass)

What is 98.09 g/mole?

300

How many grams are in 2.50 moles of NaCl?

What is 146 grams NaCl ?

400

How many grams are in 3.0 × 10²³ molecules of NH₃?

8.5 Grams NH₃

500

How many atoms of oxygen are in 2.25 moles of Ca(NO₃)₂?

8.127x10²³ Oxygen Atoms

Types of Reactions

100

Classify:
2H₂ + O₂ → 2H₂O  

Synthesis

200

Classify:
CaCO₃ → CaO + CO₂

Decomposition

300

Classify:
Zn + 2HCl → ZnCl₂ + H₂

Single Replacement

400

Predict the products, and classify:
C₃H₈ + O₂ →

CO₂  and H₂O; Combustion

500

Predict the products, balance, and classify:
Na₂SO₄ + BaCl₂ →

Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl  

Double Replacement

Stoichiometry

100

N₂ + 3H₂ → 2NH₃
If you have 3 moles of H₂, how many moles of NH₃ can be produced?

2 Moles NH₃

200

2H₂ + O₂ → 2H₂O
If you have 4 moles of H₂, how many moles of H₂O form?

4 Moles H₂O

300

N₂ + 3H₂ → 2NH₃
How many moles of NH₃ are produced from 25.0 grams of N₂?

1.78 Moles NH₃

400

2H₂ + O₂ → 2H₂O
How many grams of H₂O are produced from 67.0 grams of O₂?

75.5 grams H₂O

500

 

When silver nitrate reacts with sodium chloride, solid silver chloride forms along with aqueous sodium nitrate.

• Write and balance the equation
• Then determine:
  How many grams of AgCl are produced from 25.0 g of AgNO₃ (assume excess NaCl)?

Balanced equation:
AgNO₃ + NaCl → AgCl + NaNO₃

Molar masses:
AgNO₃ ≈ 169.9 g/mol
AgCl ≈ 143.3 g/mol

25.0 g AgNO₃ → 0.147 mol AgNO₃
Mole ratio 1:1 → 0.147 mol AgCl
→ 21.1 g AgCl

Balancing Equations

100

Balance:
H₂ + O₂ → H₂O

2H₂ + O₂ → 2H₂O

200

Balance:
Fe + O₂ → Fe₂O₃

4Fe + 3O₂ → 2 Fe₂O₃

300

Balance:
C₂H₈ + O₂ → CO₂ + H₂O

C₂H₈ + 4O₂ → 2CO₂ + 4H₂O

400

Balance:
Al + HCl → AlCl₃ + H₂

2Al + 6HCl → 2AlCl₃ + 3H₂

500

Balance:
C₄H₁₀ + O₂ → CO₂ + H₂O

2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O

H Limiting and Excess Reactants

100

2H₂ + O₂ → 2H₂O
If you have 2 moles of H₂ and 2 moles of O₂, which is limiting?

You only need 1 mol O₂ for 2 mol H₂, but you have 2 mol O₂ → H₂ is limiting

200

N₂ + 3H₂ → 2NH₃
If you have 1 mole N₂ and 2 moles H₂, which is limiting?

Need 3 mol H₂ for 1 mol N₂, but only have 2 → H₂ is limiting

300

2H₂ + O₂ → 2H₂O
If you have 4 moles H₂ and 1 mole O₂, which is limiting?

Need 2 mol H₂ for 1 mol O₂, but have extra H₂ → O₂ is limiting

400

2H₂ + O₂ → 2H₂O
If you start with 4 moles H₂ and 3 moles O₂, how many moles of H₂O form?

4 mol H₂O produced

500

N₂ + 3H₂ → 2NH₃
If you start with 28 g of N₂ and 6.0 g of H₂:

• Identify the limiting reactant
• How many grams of NH₃ are produced?

Need 3 mol H₂ per 1 mol N₂ → perfectly matched
→ Neither is limiting (perfect ratio)

Now find product:
1 mol N₂ → 2 mol NH₃

2 mol NH₃ × 17.0 g/mol = 34.0 g NH₃