Estimating the Size of a Mole Lab

Name:______

Objective: To determine the volume and mass of 1 mole of split peas.

Pre-Lab Questions:

1. How many objects are in one mole?

2. What is the mass of 1 mole of gold (Au)?

3. What is the mass of 1 mole of glucose (C6H12O6)?

4. If you had 24.65 grams of aluminum chloride, how many moles would that be?

5. Which would have a greater mass: 2 moles of hydrogen or 1 mole of lithium?

Hypothesis: I think that the mass of one mole of split peas will be ______

I think that the volume of one mole of split peas will be______

Materials: Plastic cup 8

Balance

Split Peas

100mL graduated cylinder

Procedures: 1. Determine the mass of 25 split peas.

2. Fill a 100mL graduated cylinder with split peas.

3. Determine the mass of 100mL of split peas.

4. Use the data gathered to complete the data table.

Data Table:

Mass of 25 split peas: ______grams

Mass of 1 split pea: (Mass of 25 split peas / 25) ______grams

______

Volume

Mass of 100mL of split peas: ______grams

Number of split peas in 100mL:

(Mass of 100mL of split peas / Mass of 1 split pea)

______split peas

Volume of 1 split pea:

(100mL / number of split peas in 100mL)

______mL

______

Molar Mass of Volume

Mass of one mole of split peas:

(Mass of 1 split pea X 6.02 x 1023) ______grams 8

Volume of one mole of split peas:

(Volume of 1 split pea X 6.02 x 1023) ______mL

Post Lab Questions (in complete sentences):

1. How did your hypothesis compare to the calculate molar masses and volumes?

2. Why was the mass of 25 split peas determined rather thatn the mass of just one split pea?

3. Using your data, what would be the mass of 100 split peas? What would be the volume of 100 split peas?

4. Why do we use Avogadro’s number when discussing atoms?