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Chemistry 1 and Chemistry 2 Reviews

Percent Composition of Compounds

1a.) Find percent composition of H2SO4.

  b.) Find percent composition of CuSO4.

 

Calculation of Empirical Formulas

 

2a.) Determine the empirical formula for a compound containing 32.4% sodium, 22.6%       

       sulfur, and 45% oxygen.

 

  b.) Determine the empirical formula for a compound containing 15.77% aluminum, 

       28.11% sulfur, and 56.12% oxygen.

 

Calculation of Molecular Formulas

 

3a.) The empirical formula of a compound is CH2 and its molar mass is 28g/mol.  What is 

       its molecular formula?

 

  b.) The empirical formula of a compound is CH4O and its molar mass is 192g/mol.   

        What is its molecular formula?

 

Limiting Reactant

 

4a.) 2KCl + 3O2 à 2KClO3.  Which is the limiting reactant if there are 100g each of   

       KCl and O2?

 

  b.) S + H2SO4 à SO2 + H2O.  Which is the limiting reactant if there are 5g each of S and

       H2SO4?

 

Calculations Involving a Limiting Reactant

 

5a.) 18.0g of Br is reacted with 40.0mL of 6.0mol/L Ba(OH)2.  How much Ba(BrO3)2 is

        produced?

 

        6Br2 + 6Ba(OH)2 à Ba(BrO3)2 + 5BaBr2 + 6H2O   

 

  b.) 1.0g of H2 is reacted with 1.0g of MnO2 .  How much H2O is produced?

        H2 + MnO2 à MnO + H2O

 

Percent Yield

 

6a.) If the actual and theoretical yield is 15.0g and 18.0g respectively, what is the  

       percentage yield?

 

  b.) If 8.3g of Na were reacted with 14.0g of Cl, 19.5g of NaCl was produced.  Find the

       percentage yield.  [2Na(s) + Cl2(g) à 2NaCl(s) ]

 

Balancing Chemical Equations

 

7a.) C2H5OH + O2 à CO2 + H2O

 

  b.) NH3 + O2 à NO + H2O

 

Isotopes

 

 

8.         Name     Symbol     Atomic Number     Mass Number     Neutrons 

  a.)   Nitrogen      147N             ______             ______             ______   

 

  b.)   Krypton      ______           36    _               84                ______

 

  c.)      Lead       ______          ____                  206                ______

 

 

Answers:

1a.) H:2.04%     O:65.31%     S:32.65%  b.) Cu: 39.8%     S: 20.1%     O: 40.1%

 

2a.) Na2SO4                    b.) Al2S3O12 [or Al2(SO4)3]

 

3a.) C2H4                       b.) C6H24O6

4a.) KCl                        b.) H2SO4

 

5a.) 7.38g                      b.) 0.207g

 

6a.) 83.3%                    b.) 92.59%

 

7a.) C2H5OH + 3O2 à 2CO2 + 3H2O                     b.) 4NH3 + 5O2 à 4NO + 6H2O

                       

8a.) 7, 14, 7                   b.) 8436Kr, 48                   c.) 20682Pb, 82, 124

 

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