# 41.4: Procedures


You will use dozens of items to visualize moles of particles (atoms/molecules).

## Dozens

1. Draw two tables in which to record your data for dozens, grams, and pieces.  Do not fill in data until you have read the instructions for obtaining that data.

Table $$\PageIndex{1}$$: Dozens

Item

Measured Mass per Dozen

Calculated Dozens in 15 Grams

Calculated Mass of 3 Dozen

Measured Mass of 3 Dozen

Small Paperclips

Large Paperclips

Small Metal Nuts

Large Metal Nuts

Table $$\PageIndex{2}$$: Pieces

Item

Calculated Dozens per 36 Pieces

Calculated Mass of 1 Piece

Measured Mass of 1 Piece

Small Paperclips

Large Paperclips

Small Metal Nuts

Large Metal Nuts

1. Measure and record in your dozens data table, the mass in grams of one dozen small paperclips, one dozen large paperclips, one dozen small metal nuts, and one dozen large metal nuts.

2. Calculate how many dozens a 15 gram sample would contain, for each type of item.  Record these values in your dozens data table.

3. Calculate and record in your dozens data table, the mass of 3 dozen for each type of item.  Then use the triple beam balance to measure the mass of 3 dozen, for each type of item.

4. Calculate and record in your pieces data table, the number of dozens in a 36 piece sample, for each type of item.

5. Calculate and record in your pieces data table, the average mass in grams of one piece, for each type of item.  Then use the triple beam balance to measure the mass of one piece, for each type of item.

## Moles

1. Draw two tables in which to record your data for moles, grams, and particles.  Read the instructions for determining the values to enter in these tables.  You will be following similar processes as you followed for the metal items, for each column in the data tables.

Table $$\PageIndex{3}$$: Moles

Element

Measured Mass per Mole

Calculated Moles in 15 Grams

Calculated Mass of 3 Moles

Aluminum

Iron

Helium

Carbon

Table $$\PageIndex{4}$$: Particles

Element

Calculated Moles per $$1.8 \times 10^{24}$$ Atoms

Calculated Mass of 1 Atom

Aluminum

Iron

Helium

Carbon

1. Use the periodic table to determine the measured mass in grams of one mole of atoms, for each type of atom listed in the table.  Record these values in your moles data table.

2. Calculate how many moles a 15 gram sample would contain, for each type of atom.  Record these values in your moles data table.

3. Calculate and record in your moles data table, the mass of 3 moles for each type of atom listed.

4. Calculate and record in your particles data table, the number of moles in a sample that contains $$1.806 \times 10^{24}$$ particles, for each type of atom.

5. Calculate and record in your particles data table, the average mass in grams of one particle, for each type of atom.

## Clean-up

• Check that none of your paperclips or metal nuts were mixed