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# environmental chemistry watch

1. If every citizen of the planet would plant a tree tomorrow, how long CO2 concentration in the air would decrease by 1 ppm?
-world population is 7 billion people;
-Each year the tree produces 9 kg O2:
-the Volume of atmosphere = 4.3 * 1021.
2. (Original post by Savvan)
If every citizen of the planet would plant a tree tomorrow, how long CO2 concentration in the air would decrease by 1 ppm?
-world population is 7 billion people;
-Each year the tree produces 9 kg O2:
-the Volume of atmosphere = 4.3 * 1021.
3. (Original post by charco)
V CO2 = V atm * C CO2 = 4.3*1021 * 10-6 L CO2
=> V CO2 = 4.3*1015 L CO2
1 mole CO2 ... 22.4 L
x moles...4.3*1015 L
=> x=1,92*1014 moles CO2

a 9*103 g
6CO2 + 6H2O --> C6H12O + 6O2
6*44g 6*32g

=> a=12.37 kg CO2 / tree-year

=> 12.37*103 / 44 moles = 2,81*102 moles CO2 =>281 moles CO2 / tree-year
total number of moles: nCO2 = 7*109*281 = 1967*109 moles CO2/year
time/year = 1.9*1014/1967*109 = 96.5 years ≈ 97 years.

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