Mole Stations Pt 2

Moles Stations Part 2

Station #1: Water

Procedure:

Take the necessary measurements, and record them with units. Show all your calculations, rounding your answers to two decimals points and labeling units clearly.

1. Find the mass of 50.0 mL of water, using the graduated cylinder. Be sure to zero out the weight of the graduated cylinder before adding the water to the cylinder. Record the mass of the water.

2. Calculate and record the molar mass of water (H₂O).

3. Is 50.0 mL of water less than, equal to, or more than one mole of water?

4. How many moles of water are in 50.0 mL of water?

5. How many molecules of water are in 50.0 mL of water?

6. What is the density of your water sample? (reminder: density = mass/volume)

7. Calculate the percent by mass of each element (H and O) in water (H2O).

Check your answers with the student water experts, and ask them to initial your original data to certify that they are correct.

Moles Stations Part 2

Station #2: Salt

Procedure:

Take the necessary measurements, and record them with units. Show all your calculations, rounding your answers to two decimals points and labeling units clearly.

1. Use a weighing dish to determine the mass of the sodium chloride sample in the bowl. Remember to zero out the weighing dish.

2. Find and record the molar mass of sodium chloride (NaCl).

3. Is the amount in the salt sample less than, equal to, or more than one mole of sodium chloride?

4. How many moles of sodium chloride are in the sample?

5. How many molecules of sodium chloride are in the sample?

6. Calculate the percent by mass of each element (Na and Cl) in the salt sodium chloride (NaCl).

7. Calculate the percent by mass of each element (Ca and Cl₂) in the salt calcium chloride (CaCl₂).

Check your answers with the student sodium chloride experts, and ask them to initial your original data to certify that they are correct.

Moles Stations Part 2

Station #3: Chalk

Procedure:

Take the necessary measurements, and record them with units. Show all your calculations, rounding your answers to two decimals points and labeling units clearly.

1. Find the mass of a piece of sidewalk chalk.

2. Write your name on the chalkboard with the piece of chalk and make sure to erase chalkboard after.

3. Find the mass of your piece of chalk following your writing.

4. What is the molar mass of chalk (calcium carbonate [CaCO₃])?

5. How many grams of chalk did you leave on the chalkboard?

6. Is the amount left on the chalkboard more than, equal to, or less than one mole of chalk?

7. How many moles of chalk did you leave on the chalkboard?

8. How many molecules of chalk did you leave on the chalkboard?

9. Calculate the percent oxygen in the mass of chalk (calcium carbonate [CaCO₃]).

Check your answers with the student calcium carbonate experts, and ask them to initial your original data to certify that they are correct.

Moles Stations Part 2

Station #4: “Candium”, The Fictitious Compound

Procedure:

Take the necessary measurements, and record them with units. Show all your calculations, rounding your answers to two decimals points and labeling units clearly.

1. Assume that each kind of candy (“Mm” and “Sk”) in the sample of “candium” represents a different type of atom and that the sample is the compound. Write the formula in the format Mm_xSk_y for the compound “candium,”.

2. Find and record the mass of the Mm atom in your sample.

3. Find and record the mass of the Sk atom in your sample.

4. Calculate and record the molar mass of candium. (Assume your sample is one mole.)

5. What is the percent by mass of Mm in candium?

6. What is the percent by mass of Sk in candium?

Check your answers with your teacher, and ask him/her to initial your original data to certify that they are correct.