STOICHIOMETRY PRACTICE #2

Stoichiometry​
PRACTICE #2

Complete the quizizz as you finish the practice.

Fill in the Blanks

What always goes on top to start the problem? The _ _ _ _ _ over 1.

​Start #1 on your practice #2. If 4.25 mol of Fe are produced, who many moles of Fe₃O₄ were used?

​2

Labeling

#1) Fill in the problem with the correct conversion factors

Drag labels to their correct position on the image

9 mol Fe

4 mol Al₂O₃

8 mol Al

3 mol Fe₃O₄

Multiple Choice

Rounded to two decimal places, what is the correct answer for #1?

• 1.42 mol Fe

• 1.42 mol Fe₃O₄

Drag and Drop

In #1 you should calculate by doing the following: Multiply 4.25 by ​

Placeholder

and divide by ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

3

9

1

​#2) How many grams of Al are needed to combine with Fe₃O₄?

​Start with your given over 1. Move UNIT and SUBSTANCE diagonally.

Multiple Choice

#2: Where do you find the numbers that the arrows are pointing to in problem #2? (You can click on picture for a better view)

• coefficient from balanced chemical equation

• added masses from the periodic table

• those will always be "1"

Labeling

Fill in the correct conversion factor for #2.

Drag labels to their correct position on the image

26.98 g Fe₃O₄

26.98 g Al

8 mol Al

1 mol Al

​#2: Multiply the top and divide by bottom. Your answer should be 518 g Al.



#3) How many moles of Fe₃O₄ are needed to react with 4.22 g Al?

Labeling

Fill in the correct conversion factors

Drag labels to their correct position on the image

3 mol Fe₃O₄

8 mol Al

1 mol Al

26.98 g Al

​#3: Multiply the top and divide by bottom. Your answer should be .059 mol Fe₃O₄.



#4) If 9.22 grams of Fe were produced, how many grams of Al₂O₃ were also produced?

​Fill in the correct numbers and units to complete the problem.

Reorder

SET UP NUMBER 4 BEFORE DOING THIS ONE

Reorder the following to the conversions being made (TOP OF THE TRACKS)

• GIVEN mass in grams of Fe

• convert to mol of Fe using molar mass

• then to mol of Al₂O₃ using coefficients from reaction

• to molar mass of Al₂O₃ from periodic table

• multiply the top and divide by bottom

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

​#4: Multiply the top and divide by bottom. Your answer should be 7.48 g Al₂O₃.



#5) How many grams of O₂ will react with 5.00 g C₄H₈?
BALANCE THE REACTION & COMPLETE ON OWN








Turn in your paper when done.