Study Guide
7&8

I.  Short Topics
  1.  Anion vs Cation

  2.  Traditional naming system

  3.  Stock naming system

  4.  Molecular naming system

  5.  Types of formulas

  6.  Isomers

II.  Write the names (1-5) and formulas (6-10) for the following compounds.

                              Stock                       Traditional                    Molecular

 1.  FeCl3 -                                                                                X
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 2.  P2O5 -                                                    X
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 3.  CuS -                                                                                  X
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 4.  N2O -                                                     X
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5.  Cr3(PO5)2 -                                                X                            X
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6.  Gold III Chloride -                    ___________

7.  Magnesium (hyponitrite)-1 -            ___________

8.  Cuprous oxide -                        ___________

9.  Sodium (sulfate)-2 -                   ___________

10.  Chromium III phosphide -              ___________


Stoichiometry problems    ( K-39,  S-32,  O-16,  N-14,  C-12,  Zn-65.4,  Cl-35.5,  H-1)

I.  Mole relationships

   1.  What is the mass of 8.25 moles of potassium phosphate (K2SO4)?




   2. What volume in dm3 does 4.55 moles of nitrogen (N2) under conditions of STP 
        occupy?
           


   3.  How many molecules of carbon dioxide (CO2) are found in an 85 dm3container  
        under conditions of STP?



II.  Percent composition

   1.  What is the % composition of nitrogen in dinitrogen tetroxide (N2O4).




   2.  What is the % composition of oxygen in a compound if a 0.432 g sample of the   
        compound is found to contain 0.128 g of oxygen and 0.304 g of fluorine.




III  Empirical & Molecular formulas

   1.  Find the empirical formula of a compound, given that the compound is found to 
        contain 47.95 % zinc (Zn) and 52.1% chlorine (Cl) by mass.






   2.  What is the molecular formula of a compound, given that upon analysis a sample
         is found to contain 169.7 g of carbon (C) and 42.4 g of hydrogen (H)?  The 
         gram formula weight (GFW) for the compound is 30 g.