Introduction to Stoichiometry Day 1

Introduction to Stoichiometry Day 1

Multiple Choice

The first step in stoichiometry is to

• Determine a balanced equation

• convert grams to moles

• convert grams to liters

• use the mole ratio

Multiple Choice

What can be determined from a balanced chemical equation?

• Mole ratio of any two substances in the reaction

• Energy released in the reaction.

• Electron configuration of all elements in the reaction.

• Mechanism involved in the reaction.

Multiple Choice

The __________ in a balanced equation reveals the mole ratios of the substances involved.

• subscript

• coefficients

• superscript

• total number in each compound

Multiple Choice

In the chemical reaction described by the equation

4Fe(s) + 3O2(g) ® 2Fe2O3(s),

the mole ratio of iron(III) oxide to iron is

• 1:1

• 1:2

• 2:3

• 4:1

Multiple Choice

The chemical equation P4O10 + 6H2O ® 4H3PO4 can be interpreted correctly as

• a. 1 molecule of P4O10 + 6 molecules of H2O form 4 molecules of H3PO4.

• b. 1 mol of P4O10 + 6 mol of H2O reacts to form 4 mol of H3PO4.

• c. 1 g of P4O10 + 6 g of H2O produces 4 g of H3PO4.

• d. Both (a) and (b)

Multiple Choice

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

What is the total number of moles of water needed to make 2.5 moles of C₆H₁₂O₆?

• 2.5

• 6

• 12

• 15

Multiple Choice

Using the following equation:

Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)

How many moles of iron can be made from 6 moles H₂?

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

Multiple Choice

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

New problem: If 16 moles of carbon dioxide are formed by this reaction, how many moles of water were also produced?

• 4 mol H₂O

• 6 mol H₂O

• 24 mol H₂O

• 96 mol H₂O

• 384 mol H₂O

Multiple Choice

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂ 
What is the total number of moles of water needed to make 2.5 moles of C₆H₁₂O₆?

• 2.5
• 6
• 12
• 15

Multiple Choice

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

• 6
• 2
• 3
• 1

Multiple Choice

2H₂   +   O₂  →  2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles
• 8 moles
• 16 moles
• 2 moles

Multiple Choice

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe
• 6 moles Fe
• 9 moles Fe
• 2 moles Fe

Multiple Choice

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂ 
What is the total number of moles of water needed to make 2.5 moles of C₆H₁₂O₆?

• 2.5
• 6
• 12
• 15

Multiple Choice

4NH₃ + 5O₂-->4NO + 6H₂O
What is the total number of moles of H₂O produced when 12 mole of NH₃ is completely consumed?

• 15
• 18
• 20
• 24

Multiple Choice

N₂ + 3H₂ → 2NH₃

What is the mole ratio between N₂ and NH₃ in the above reaction?

• 1 moles NH₃ / 2 moles N₂

• 2 moles NH₃ / 1 moles N₂

• 2 moles N₂ / 3 moles NH₃

• 1 moles N₂ / 3 moles NH₃