“Mole” Concept Worksheet

1. Calculate the formula mass of a mole of the following compounds.
   1. C₉H₈O₄ (aspirin)
   2. Mg(OH)₂ (milk of magnesia)
   3. (NH₄)₂CO₃ (an active dry base in baking powder)
   4. Sodium hydroxide (primary ingredient in lye)
   5. Calcium carbonate (active ingredient in “tums” antacid)
   6. Calcium chloride (used as a drying agent such as in our desiccators)

2. Determine the proper chemical name for the ionic compounds from problem 1b and c.

3. Write the proper formula for the ionic compounds from problem 1d, e and f

4. An experiment calls for 24.0 moles of ammonia (NH₃). How many grams is this?

5. A student weighs out 12.5 g of NaCl. How many moles is this?

6. A typical 5-grain aspirin tablet contains 180 g of pure aspirin.
   1. How many moles of aspirin is this?
   2. How many aspirin molecules are contained in the tablet?

7. How many carbon dioxide molecules are there in a) 0.5 mole of carbon dioxide? b)0.1 mole of carbon dioxide?

8. If the molecular mass of nitrogen (N₂) is 28 g/mole, what would be the mass of a) 0.5 moles of nitrogen gas? B) 0.1 mole of nitrogen gas?

9. How many grams of each substance are represented by the following:
   1. 2.0 mole of magnesium oxide?
   2. 0.50 mole of sodium chloride?
   3. 0.10 mole of copper?
   4. 0.02 mole of silver nitrate?
       

 10.  Determine the mass of one platinum atom.