Environmental Chemistry

rule.gif (1629 bytes)

Homework Assignment 12 (20 points)

 

  1. How many metric tons of 5%-S coal would be needed to yield the H2SO4 required to produce a 3.00 centimeter rainfall of pH 2.00 over a 100 km2 area?
  2. In what major respect is NO2 a more significant species than SO2 in terms of precipitation in atmospheric chemical reactions?
  3. How many metric tons of coal containing an average of 2% S are required to produce 100 million metric tons of SO2? 100 million metric tons is the amount of SO2 released annually from electricity production.
  4. Assume that the wet limestone process requires 1 metric ton of CaCO3 to remove 90% of the sulfur from 4 metric tons of coal containing 2% S. Assume that the sulfur product is CaSO4. Calculate the percentage of the limestone converted to calcium sulfate.
  5. Calculate the number of metric tons of CaCO3 required each year to remove 90% of the sulfur from 1 billion metric tons of coal (approximate annual U.S. consumption), assuming an average of 2% sulfur in the coal.

ENV 440 Homework

Environmental Chemistry -- ENV 440
Last Updated:  04/12/2004