UNDERSTANDING THE MOLE

In chemistry, the fundamental unit of matter is the mole.  You must understand and be able to use the mole concept.  In this activity, you will practice determining the number of moles, number of grams, number of atoms, and number of molecules of different substances.  Make sure that you show your work!  (There is room to the right side of each table for you to show your work.)

STATION #1:  AVERAGE MASS OF PLASTIC BAGS
Determine and record the mass of three different plastic bags with labels.
Calculate the average mass of one plastic bag.

Bag #1

_______________

grams

Bag #2

_______________

grams

Bag #3

_______________

grams

Average

_______________

grams

 

STATION #2:  COPPER
Determine and record the mass of the plastic bag with the copper.  What is the mass of the copper in the bag?
~ Calculate the number of moles of copper in the bag.
~ Calculate the number of atoms of copper in the bag.

Mass of bag with copper

_______________

grams

Mass of copper

_______________

grams

Moles of copper

_______________

moles

Atoms of copper

_______________

atoms

 

STATION #3:  BAKING SODA (SODIUM BICARBONATE – NaHCO3)

Determine and record the mass of the plastic bag with baking soda.  What is the mass of the baking soda in the bag?

~ Calculate the number of moles of baking soda in the bag.

~ Calculate the number of molecules of baking soda in the bag.

 

Mass of bag with baking soda

_______________

grams

Mass of baking soda

_______________

grams

Moles of baking soda

_______________

moles

Molecules of baking soda

_______________

molecules

 

STATION #4:  WATER

Fill a clean, unused paper cup about two-thirds full of water.  Determine and record the mass of the paper cup and water.  Take a drink of the water.  Determine and record the mass of the cup and the water left in it.  Throw the used cup in the trash.

~ How many moles of water did you drink?

~ How many molecules of water did you drink?

 

Mass of cup & water before drinking

_______________

grams

Mass of cup & water after drinking

_______________

grams

Mass of water

_______________

grams

Moles of water

_______________

moles

Molecules of water

_______________

molecules

 

STATION #5:  CALCIUM SULFATE (CaSO4)

Determine and record the mass of the plastic bag with calcium sulfate.

~ How many moles of calcium sulfate are in the bag?

~ How many moles of oxygen are contained in the calcium sulfate in the bag? *

 

Mass of bag and calcium sulfate

_______________

grams

Mass of calcium sulfate

_______________

grams

Moles of calcium sulfate

_______________

moles

Moles of oxygen *

_______________

moles

 

STATION #6:  TABLE SALT (SODIUM CHLORIDE – NaCl)

Record the number of moles of sodium chloride given on the label of the plastic bag with the salt.

Determine and record the mass of the plastic bag with salt in it.

~ How many moles of salt are in the bag?

~ What is your percent error?  (Assume that the number given on the bag is the “accepted value”.)

 

Accepted # of moles of NaCl in bag

_______________

moles

Mass of bag and salt

_______________

grams

Mass of salt

_______________

grams

Moles of salt

_______________

moles

Percent error

_______________

%

 

STATION #7:  IRON

Record the number of atoms of iron given on the label of the plastic bag with the iron.

Determine and record the mass of the plastic bag with iron in it.

~ How many moles of iron are in the bag?

~ How many atoms of iron are in the bag?

~ What is your percent error?  (Assume that the number given on the bag is the “accepted value”.)

 

Accepted # of atoms of Fe in bag

_______________

atoms

Mass of bag and iron

_______________

grams

Mass of iron

_______________

grams

Moles of iron

_______________

moles

Atoms of iron

_______________

atoms

Percent error

_______________

%

 

 

Back to the Unit 3 Labs and Activities Page

Back to the Unit 3 Page

Back to the Main Page