If everybody in the world would plant a tree tomorrow, how long would it take for these trees to make a 1 ppm difference in the CO2 concentration?

During the discussion on atmospheric processes we calculated the pH of several types of acid rain. Box 3.8 (Removal of sulphur dioxide from an air parcel) shows us how to calculate the pH based on sulphuric acid formation. However not all steps are included.
For this homework:
• Repeat the pH calculation but include all necessary steps and show the work.
• Explain the last statement “Evaporation of water from the droplet and removal of further SO2 as the droplet falls…..” with more detail. You can use calculations if need be.

2. This quote appeared in Chemical and Engineering News (Sept. 3, 1990, p. 52): “One tree can assimilate about 6 kg of CO2 per year or enough to offset the pollution produced by driving one car for 26,000 miles.”
Is this statement likely correct? Justify your answer quantitatively.
Assume: Gasoline is C9H16, the combustion is complete, and the car get 20 miles per gallon.

3. If everybody in the world would plant a tree tomorrow, how long would it take for these trees to make a 1 ppm difference in the CO2 concentration?
Assume:
• 7 billion people
• 9 kg of O2 produced per tree each year regardless of age
• C6H12O2 and O2 is produced by combining CO2 and H2O
• Mass of Earth’s atmosphere is 5.3 x 1018 kg

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