Chemical Analysis and Stoichiometry Problem Set

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  1. The routine quality control analysis for an amino acid feedstock in a large chemical production plant returns the following combustion analysis. For each of these samples determine if the amino acid is tyrosine (C9H11NO3), alanine (C3H7NO2) or Valine (C5H11NO2) by calculating the emperical formula using the data provided.
    Combustion Analysis Report
    Mass of sample (mg) 46.87
    Mass of CO2 (mg) 102.42
    Mass of H2O (mg) 25.62
    % N by mass 7.731
    Combustion Analysis Report
    Mass of sample (mg) 61.48
    Mass of CO2 (mg) 115.65
    Mass of H2O (mg) 52.07
    % N by mass 11.958
  2. Write a balanced overall chemical equiation, total ionic equation, and net ionic equation for the following reactions. If you begin with 5.0 g of each reactant and end with 125.0 mL of solution, what is the concentration of each ion in solution?
    1. aqueous sodium hydroxide reacts with aqueous hydrobromic acid
    2. aqueous sodium chloride reacts with aqueous ammonium phospahte
    3. aqueous sodium bromide reacts with aqueous lead chlorate
    4. aqueous phosphoric acid reacts with aqueous potassium hydroxide
    5. aqueous sulfuric acid reacts with aqueous sodium fluoride

[problem set 8 solutions]