Environmental Chemistry

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Homework Assignment 10 (20 points)

 

  1. Considering the total number of electrons in NO2, why might it be expected that the reaction of a free radical with NO2 is a chain-terminating reaction?
  2. Suppose that 22.4 liters of air at STP is used to burn 1.50 g of carbon to form CO2, and that the gaseous product is adjusted to STP. What is the volume and average molar mass of the resulting mixture?
  3. Of the gases neon, sulfur dioxide, helium, oxygen and nitrogen, which shows the most variation in its atmospheric concentration? Why?
  4. A 12.0-liter sample of air at 25 °C and 1.00 atm pressure was collected and dried. After drying, the volume of the sample was exactly 11.50 L. What was the percentage by weight of water in the original air sample?
  5. At an altitude of 50 km, the average atmospheric temperature is essentially 0 °C. What is the average number of air molecules per cubic centimeter of air at this altitude?

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    ENV 440 Homework

Environmental Chemistry -- ENV 440
Last Updated:  03/23/04