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Chemistry, 7/e
Raymond Chang, Williams College
Gases

Internet Exercises

Los Alamos National Laboratory
(http://www.shef.ac.uk/chemistry/web-elements/main/index-nofr.html)

  1. Another popular periodic table on the web, located at the Los Alamos National Laboratory, gives some background information on each element. Go to http://www.shef.ac.uk/chemistry/web-elements/main/index-nofr.html, look at the information given for argon, and then answer the following:
    1. At what pressure is argon used in electric light bulbs and fluorescent tubes?
    2. Calculate the pressure (in atm) exerted by 1.95 moles of the gas in a steel vessel occupying a volume of 5.73 L at 58.6°C.
    3. A certain lightbulb containing argon at the temperature and pressure given above is cooled to 18°C at a constant volume. Calculate its final pressure in mm of Hg.
NIST Webbook
( http://webbook.nist.gov/chemistry/)

  1. The NIST Webbook at http://webbook.nist.gov/chemistry/ is a useful database that provides a search function to find out information about compounds using only a name, formula, molecular weight, or other piece of known information. Search for ammonia by using its formula, and then answer the following:
    1. Calculate the density in g/L of NH3 at 752 mm Hg and 43°C.
    2. Calculate the root-mean-square speed of molecular nitrogen at 20°C.
http://wwwchem.csustan.edu/chem1002/gasevol.htm
(http://wwwchem.csustan.edu/chem1002/gasevol.htm)

  1. Some universities post their experiments on webpages. Fortunately, most of these pages provide a bit of theory so that any student reading the material will understand the relationship between the concepts and the actual lab. Study the experiment given at http://wwwchem.csustan.edu/chem1002/gasevol.htm.
    1. How many moles of carbon dioxide will be produced if 5 grams of sodium bicarbonate are used?
    2. If a sample of the gas were heated in a flexible container, would the volume of its container increase or decrease?
    3. Suppose 500 mL of carbon dioxide were collected. If the pressure inside the flask is 2 atm and the volume of the container is increased at a constant temperature to 600 mL, what is the final pressure?








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