Stoichiometry Map

How to use a Stoichiometry Map

1. Determine known and unknown

2. Use map to determine number of steps

3. Set up problem

4. Solve

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Using Stoichiometry Map

Lets Try it!

If 3.69 moles of O₂ are reacted, how many grams of K₂O₂ (molar mass 110.2 g/mol) will be produced?

2 K₂O + O₂ → 2 K₂O₂

Multiple Choice

What is the known/given of this problem?

If 3.69 moles of O₂ are reacted, how many grams of K₂O₂ (molar mass 110.2 g/mol) will be produced?

• 3.69 mol O2

• 3.69 g K2O2

• 3.69 mol K2O2

• 110.2 g O2

Multiple Choice

What is the unknown of this problem?

If 3.69 moles of O₂ are reacted, how many grams of K₂O₂ (molar mass 110.2 g/mol) will be produced?

• grams O2

• mol K2O2

• grams of K2O2

• molar mass

Since our known is moles we will start at Moles A and make our way to grams.

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How many steps do we need?

Hotspot

Click on the map where you would start.

If 3.69 moles of O₂ are reacted, how many grams of K₂O₂ (molar mass 110.2 g/mol) will be produced?

Hotspot

Click on the map where you would end

If 3.69 moles of O₂ are reacted, how many grams of K₂O₂ (molar mass 110.2 g/mol) will be produced?

Multiple Choice

How many step do we need for this problem?

• 1

• 2

• 3

• 4

Start by placing your known over 1

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Time to set up our problem

Use your balanced equation to set up mole ratio. ​

Step 1: we need to go from mol of O₂ to mol of K₂O₂

2 K₂O + O₂ → 2 K₂O₂

known

Step 1

For this problem the molar mass was provided but if not you would calculate with your periodic table

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​Step 2: we need to go from mol of K₂O₂ to grams of K₂O₂

Known

Step 1

Step 2

Since all numbers are on the top we will multiply straight across

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Time to Solve!

Multiple Choice

What is the final answer to this question?

• 813.28 g K2O2

• 220.4 g K2O2

• 330.6 g K2O2

• 7.38 g K2O2

Multiple Choice

How many steps are needed to solve the following problem?

If 322.0 grams of NO (molar mass 30.01 g/mol) are produced, how many moles of SO₂ were reacted at STP?

• 1

• 2

• 3

• 4

Labelling

If 322.0 grams of NO (molar mass 30.01 g/mol) are produced, how many moles of SO₂ were reacted ?

SO₂ + NO₂ → NO + SO₃

Drag labels to their correct position on the image

1 mol NO

1 mol SO2

30.01 g NO

1 mol NO

322.0 g NO

Multiple Choice

How many steps are needed to solve the following problem?

If 0.97 liters of PH₃ are produced at STP, how many atoms of H₂O  were reacted?

• 1

• 2

• 3

• 4

Labelling

If 0.97 liters of PH₃ are produced at STP, how many atoms of H₂O  were reacted?

Mg₃P₂ + 6 H₂O → 2 PH₃ + 3 Mg(OH)₂

Drag labels to their correct position on the image

6 mol H₂O

2 mol PH₃

1 mol H₂O

1 mol PH₃

0.97 L PH₃

6.02 x 10²³ atoms H₂O

22.4 L PH₃

Reorder

List the steps in order to solve stoichiometry problems using the map

• Determine the known and unknown

• Use map to determine number of steps

• Set up problem

• Solve for answer

1

2

3

4

• 1
• 2
• 3
• 4

Poll

On a scale of 1-5 do you think the map will help you?

• 1-No, I don't like it.

• 2-Ehh, Its okay but don't think it would help me.

• 3-Kinda, I like it but still confused

• 4-Yes I like it but need more practice.

• 5-Absolutely, It makes alot of sense