Stoichiometry Worksheet

 

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  1. What is stoichiometry?

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  2. What are the basic steps required for most stoichiometry calculations?

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  3. Consider:

    Al(s) + NH4ClO4(s)    → Al2O3 (s) + AlCl3 (s) + NO (g) +  H2O (g)

    What mass of ammonium perchlorate should be used for every kg of Al?

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  4. Consider:

    5CO2 + 55NH4+ + 76O2    → C5H7O2 + 54NO2– + 52H2O + 109H+

    How much bacterial tissue (C5H7O2) is produced in a treatment plant for every 1.0 x 104 kg of waste water containing 3.0% NH4+ by mass?  Assume that 95% of the ammonium ions are consumed by bacteria.

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  5. What is a limiting reactant?  How does it affect a reaction?

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  6. What clue indicates that you are dealing with a limiting reactant stoichiometry calculation?

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  7. Consider:

    2 C6H5Cl + C2HOCl3    → C14H9Cl5 + H2O

    1142 g of chlorobenzene (C6H5Cl) is reacted with 485 g of chloral (C2HOCl3).
    • What mass of DDT (C14H9Cl5) is formed?
    • What is the limiting reactant?
    • How much of excess reactant is left?

     

     

  8. What is the percent yield?
    • What is the formula used to solve for it?

      Consider:

      P4 (s) + F2 (g)      → 4PF3 (g)

      How many grams of F2 are needed to produce 120.0g of PF3 if the reaction has a 78.1% yield?

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