1.  List the atomic masses of the following elements.

    Na _______    Cl _______    N _______

     O _______     H _______    C _______


2. Calculate the molecular masses or formula masses of the 
following:

    H2 ______      H2O ______       P4 ______

   CH4 ______     C3H8 ______    H2SO4 ______

  NaCl ______     CaF2 ______   Na2SO4 ______



3. Give the mass in grams of one mole of each of the following:


   a. H2O       b. Cu       c. CuO      d. H2SO4


   e. CH4       f. Na       g. HNO3     h. CaF2


4. How many O2 molecules comprise (are in) one mole of O2 ?



5. What is the mass in grams of one mole of O2 ?


6. What is the mass in grams of one molecule of O2 ? 
(Hint: you need Avogadro's Number!!)


7. Perform the following conversions:


    0.025 mole KCl  =  ____________ g KCl

          56 g SO3  =  ____________ mole SO3

      6.0 mole CO2  =  ____________ molecules of CO2


8. A compound of manganese and oxygen has a composition by mass 
of 63.2% Mn and 36.8% O.  What is the formula of the compound?







9. Lead metal can be obtained from lead oxide (PbO) by reaction 
of charcoal at elevated temperature according to the following 
equation:

              2 PbO  + C --> 2 Pb  +  CO2

a. How many moles of lead can be obtained from 1 mole of lead oxide?



b. What mass in grams of lead can be obtained from 1 mole of lead oxide?



c. What mass in grams of PbO is necessary to make 100 g of lead by the above reaction?




d. How many moles of CO2 are produced when 100 g of lead is produced by the above reaction?





10. Sulfuric acid, an important industrial chemical, is made from 
sulfur dioxide (SO2) using the following equation:

                  2 SO2  +  02   -->  2SO3

                    SO3  +  H2O  -->  H2SO4


a. How many moles of sulfuric acid can be made from 1 mole of sulfur dioxide?





b. How many grams of sulfuric acid can be made from 150 g of sulfur dioxide?