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• Rate of reaction


  How fast a given reaction is taking place
• Determining rate of reaction


  • Measuring change in observable properties over time
  • Could be color change, temperature change, appearance of new substance, etc.
• Determining rate of reaction

  1. Measure change in concentration over time

  2. Change in n2o5 over change in time = 1/4 * change in o2 over change in time
• Observable properties used to determine rate of reaction

  • Color change
  • Temperature change
  • Appearance of new substance (precipitate)
• Rate of reaction expression: change in concentration over change in time
• Increase in pressure


  Indicates change in number of moles
• Concentration changes


  Can be monitored by measuring intensity of brown color due to n2o5 formation
• Absorbance


  Directly proportional to concentration
• Determining rate of reaction

  1. Measure change in volume

  2. Measure change in concentration with respect to time
• Rate of formation of o2 = 3.7 * 10^-5 mol/L/s
• Rate of disappearance of n2o5 = 1.9 * 10^-5 mol/L/s
• Rate of formation of no2 = 2.2 * 10^-5 mol/L/s
• Initial concentration of n2o5

  2 * 10^-2 M
• Concentration of no2 produced = 0.8 * 10^-2 M
• Concentration of o2 produced = 0.4 M