Name: ________________________________________________
Class Period: ________
How Many Moles?
Purpose: Calculate molar mass and use the concept of the mole to calculate the number of moles in various
compounds and molecules.
Procedures: GRAB AN APRON AND A PAIR OF GOGGLES! You must wear the apron the entire lab.
Part 1: Finish the Mole to gram practice & moles of chalk and get a stamp.
Part 2: Calculate the moles of sugar (Glucose) in a piece of bubble gum
1. Find the mass of the WRAPPED piece of bubble gum
2. Unwrap (save wrapper) and chew the piece of gum until all of the sugar is gone (taste is no longer
sweet).
3. While chewing, obtain the mass of the wrapper and subtract from your mass in step 1 to calculate the
beginning mass of your piece of gum.
4. After sugar is gone, obtain the mass of your chewed piece of gum (place on the wrapper, zero out the
balance)
5. Subtract your ended mass from your starting mass in order to calculate how many grams of sugar are in
your piece of gum
Mass of Gum +
Mass of the
Mass of Gum
Mass of Gum
Mass of Glucose
Wrapper
Wrapper
before chewing
after chewing
in Gum
6. Calculate molar mass of glucose (C6H12O6) and the number of moles in your piece of gum.
Part 3: Calculate how many moles of water evaporate after boiling for 3 minutes.
1. Find the mass of an empty 250mL beaker
2. Place approximately 100mL of water in the beaker; obtain the mass of the beaker and water.
3. Place the beaker on the hot plate (on the highest setting) and carefully let the water come up to a boil.
4. Let the water boil for 3 minutes then turn off the hot plate
5. Carefully remove the beaker from the hot plate (using the beaker tongs) and place it on the electronic
balance to obtain the mass after boiling
Mass of Empty
Mass of Beaker +
Mass of Water
Mass of Water
Mass of H2O
Beaker
Water before
before heating
after heating
evaporated
Heating
6. Calculate molar mass of water and the number of moles that evaporated.
**PUT ON GOGGLES BEFORE START OF PART 5**
Part 5: Calculate how many moles of carbon dioxide are produced in a reaction of Sodium bicarbonate and
acetic acid.
1. Find the mass of an large graduated cylinder
2. Place approximately 2.0 grams of Sodium bicarbonate into the large graduated cylinder (be sure to write
down exactly how much you started with if it is not exactly 2.00g)
3. Place the small graduated cylinder on the electronic balance. Zero out the balance (it should read 0.00
with the graduated cylinder on it). Place approximately 3mL of Acetic acid into the graduated cylinder
and then find the mass of the acetic acid in your small graduated cylinder
4. Carefully pour the Acetic acid into the large graduated cylinder containing the sodium bicarbonate – let
the reaction occur completely (stops producing bubbles)
5. Find the mass of the large graduated cylinder after the reaction is complete
Mass of Empty
Large Graduated
Cylinder
Mass of Sodium
bicarbonate
Mass of Acetic acid
Mass of contents in
Large Graduated
Cylinder after
reaction
Mass of CO2
produced
6. Calculate the molar mass of Carbon dioxide and the number of moles that were produced in the
reaction.
Clean Up: Empty, clean, and dry all beakers. Rinse out and clean graduated cylinders. Throw away all trash
(gum, can of coke, paper towels, etc). Neatly put back your goggles and apron. Make sure all equipment is
turned off (hot plate, electronic balance).