For a calculator, use your computer. For a periodic table, click here.

1. Just knowing that a mole = 6.02 x 10²³ is not really that useful. A mole's "magic" comes from its ability to convert the atomic information on the periodic table into the big world - the lab.
   
   Looking on your periodic. How much mass does one Lithium atom have?

   1.   ?    3
   2.   ?    6.94 amu
   3.   ?    6.94
   4.   ?    9.012 amu
   5.   ?    138.906 amu

2. The "a.m.u." after the atomic mass stands for "atomic mass units" OR the unit for the mass of an atom. (It's not used by all Chemistry teachers, but it the most accurate because it tells us that you are talking about things on the atomic level.)
   
   Find the mass of one Magnesium atom.

   1.   ?    12
   2.   ?    12 amu
   3.   ?    24.305
   4.   ?    24.305 amu

3. The atomic mass tells you how much mass an atom or a molecule has. But since atoms and molecules are so small that's not very useful in the lab. Moles allow you to easily convert from the atomic level to the real world. One mole of a substance equals the atomic mass, but in grams.
   
   Try it: How much mass does one mole of Lithium have?

   1.   ?    6.94
   2.   ?    6.94 amu
   3.   ?    6.94 grams

4. If you have a mole of an atoms, take the atomic mass and change "amu" to "grams". It's that simple.
   
   How much mass does one mole of Oxygen have?

   1.   ?    8
   2.   ?    15.999
   3.   ?    15.999 amu
   4.   ?    15.999 grams
   5.   ?    8 grams
   6.   ?    8 amu

5. How much mass does one molecule of water (H₂O) have?

   1.   ?    18.015 amu
   2.   ?    18.015 grams
   3.   ?    18.015
   4.   ?    17.007 amu
   5.   ?    17.007 grams
   6.   ?    17.007
   7.   ?    15.999
   8.   ?    15.999 amu
   9.   ?    2.016 amu
   10.   ?    2.016 grams

6. How much mass does one mole of water (H₂O) have?

   1.   ?    18.015 amu
   2.   ?    18.015 grams
   3.   ?    18.015
   4.   ?    17.007 amu
   5.   ?    17.007 grams
   6.   ?    17.007
   7.   ?    15.999
   8.   ?    15.999 amu
   9.   ?    2.016 amu
   10.   ?    2.016 grams

7. It's that easy. Find the atomic or molecular mass from the periodic table. Put "amu" if you are talking about 1 atom or 1 molecule and put grams if you are talking about moles.
   
   How much mass do two Beryllium atoms have?

   1.   ?    9.012
   2.   ?    9.012 amu
   3.   ?    9.012 grams
   4.   ?    18.024
   5.   ?    18.024 amu
   6.   ?    18.024 grams

8. How much mass do two moles of Beryllium have?

   1.   ?    9.012
   2.   ?    9.012 amu
   3.   ?    9.012 grams
   4.   ?    18.024
   5.   ?    18.024 amu
   6.   ?    18.024 grams

9. What units do we use to measure atoms and molecules?

   1.   ?    grams
   2.   ?    moles
   3.   ?    amu
   4.   ?    kilograms

10. What units do you use to measure moles?

    1.   ?    grams
    2.   ?    amu
    3.   ?    kilograms
    4.   ?    moles

11. The term "molar" just means we are talking about moles (use grams), while "molecular" means we are talking about molecules (use amu).
    
    Find the molar mass of one mole of Nitrogen.

    1.   ?    14.007
    2.   ?    14.007 amu
    3.   ?    14.007 grams

12. Find the atomic mass of Nitrogen.

    1.   ?    14.007
    2.   ?    14.007 amu
    3.   ?    14.007 grams

13. Find the molar mass of CO₂ (carbon dioxide).

    1.   ?    12.011
    2.   ?    12.011 amu
    3.   ?    12.011 grams
    4.   ?    28.01
    5.   ?    28.01 amu
    6.   ?    28.01 grams
    7.   ?    44.009
    8.   ?    44.009 amu
    9.   ?    44.009 grams

14. Find the molecular mass of CO₂ (carbon dioxide).

    1.   ?    12.011
    2.   ?    12.011 amu
    3.   ?    12.011 grams
    4.   ?    28.01
    5.   ?    28.01 amu
    6.   ?    28.01 grams
    7.   ?    44.009
    8.   ?    44.009 amu
    9.   ?    44.009 grams