MHS Chemistry
Beans & Moles

Purpose

1. To count small particles by weighing them.
2. To determine the relative masses of beans, and relate to atomic masses.
3. To help understand the mole concept.
Procedure
1. Count out exactly 100 beans of one kind and mass them on a triple beam balamce.
2. Calculate the average mass.
3. Repeat steps 1 and 2 for at least three more different kinds of beans.
4. Calculate the relative mass of each kind of bean.
5. Weigh out the relative mass (in grams) of each kind of bean and count the number of beans weighed.
Data Table

 Bean 1 (________) Bean 2 (________) Bean 3 (________) Bean 4 (________) Bean 5 (________) Kind of  bean Mass of  100 Average mass Relative mass Number of beans in relative mass

Questions (Attach answers on a separate piece of paper)
1. If a "bunch" is deeclared to be the number of beans in 1.00 grams of the lightest beans, how many beans are in a "bunch"?
2. Look at your data.  What is true of the number of beans in a relative mass of each kind of bean?
3. Predict the mass of a bunch of beans whose mass is 3.50 g.
4. Use the factor-label method to calculate the number of bunches in 1000 beans.
5. If you wanted 1000 of the heaviest bean used in this lab, how could you measure out that number without counting?
6. Calculate the number of beans in 15 bunches of Garbanzo beans.
7. What would be the mass of 35 bunches of the heaviest beans?
8. If a "mole" is declared to be the number of atome in exactly 12.00 grams of carbon-12, how many carbon atoms are there in a mole?
9. How many helium atoms are in a mole?
10. How many C12H22O11 molecules are in a mole?
11. How many grams will one mole of carbon atoms weigh?
12. If you wanted a sample of H2O containing 6.02p23 molecules, how could you measure out that appropriate number without actually counting them?
13. Calculate the mass of one mole of the lightest bean used in this lab.  Contrast that mass with the mass of the eart, 6p27 grams.

[Chapter 10 Notes][MHS Chem page]