Lesson -- practice with mole ratios

Multiple Choice

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation
• Panic
• Write an Unbalanced Equation
• Ask for help

Multiple Choice

For the Balanced Reaction:
3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe;
What is the Ratio of moles of Mg to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

Multiple Choice

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass
• our minds

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

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 5 moles of nitrogen?

• 6 mol
• 2 mol
• 3 mol
• 15 mol

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

2H₂  +   O₂  →  2H₂O
How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2
• 4
• 6
• 8

Multiple Choice

In the reaction
2 H₂ + O₂ → 2 H₂O
what is the mole ratio of oxygen to water

• 1:2
• 2:1
• 3:4
• 4:3

Multiple Choice

Consider the equation 2Al(OH)₃ --> Al₂O₃ + 3H₂O. How many moles of H₂O can be produced from 6 moles of Al(OH)₃?

• 9

• 4

• 3

• 12

Multiple Choice

Consider the equation CaSO₄ + 2LiF --> CaF₂ + Li₂SO₄. How many moles of CaSO₄ are needed to produce from 3.97 moles of CaF₂?

• 1.99

• .993

• 7.94

• 3.97

Multiple Choice

N₂ + 3H₂ ---> 2NH₃
If 3 moles of N₂ reacts with 9 moles of H₂, how many moles of NH₃ will be produced.

• 2
• 4
• 6
• 12