Scan_Doc0032 - Additional Exercises 125 is an intermediate...

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is an intermediate step in the conversion of the nitrogen in organic compounds into nitrate ions. What mass of bacterial tissue is produced in a treatment plant for every 1.0 X 10 4 kg of wastewater containing 3.0% NH4 + ions by mass? Assume that 95% of the ammonium ions are consumed by the bacteria. 125. Aspirin (C 9 H s 0 4 ) is synthesized by reacting salicylic acid (C 7 H 6 0 3 ) with acetic anhydride (C 4 H 6 0 3 ). The balanced equa- tion is a. What mass of acetic anhydride is needed to completely con- sume 1.00 X 10 2 g salicylic acid? . b. What is the maximum mass of aspirin (the theoretical yield) that could be produced in this reaction? 126. A student prepared aspirin in a laboratory experiment using the reaction in Exercise 125. The student reacted 1.50 g salicylic acid with 2.00 g acetic anhydride. The yield was 1.50 g aspirin. Calculate the theoretical yield and the percent yield for this ex- periment. 127. Hydrogen peroxide is used as a cleansing agent in the treatment of cuts and abrasions for several reasons. It is an oxidizing agent that can directly kill many microorganisms; it decomposes on contact with blood, releasing elemental oxygen gas (which in- hibits the growth of anaerobic microorganisms); and it foams on contact with blood, which provides a cleansing action. In the lab- oratory, small quantities
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This note was uploaded on 12/13/2010 for the course CHEM 2301 taught by Professor Bill during the Spring '10 term at South Texas College.

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