Answer:
5.86 Tons of Pb fall on the 535 square kilometers of Chicago in 1 year.
Explanation:
Rate of accumulation of Pb = [tex]0.03 mg/m^2 day[/tex]
Area of Chicago , A= [tex]535 km^2=535\times 1,000,000 m^2[/tex]
[tex]1 km^2=1,000,000 m^2[/tex]
Amount of Pb accumulated in an year in Chicago:
[tex]=0.03 mg/m^2 day\times A\times 1 year[/tex]
[tex]=0.03 mg/m^2 day\times A\times 365 days[/tex]
1 year = 365 days
[tex]=0.03 mg/m^2 day\times 535\times 1,000,000 m^2 \times 365 days[/tex]
[tex] 1 mg = 10^{-6} kg[/tex]
[tex]=0.03\times 10^{-6} kg/m^2 day\times 535\times 1,000,000 m^2 \times 365 days[/tex]
[tex]=5,858.25 kg[/tex]
(1 metric ton=1000 kg)
[tex]=5,858.25 kg=5,858.25\times 0.001 Ton=5.85825 Tons\approx 5.86 Tons[/tex]
5.86 Tons of Pb fall on the 535 square kilometers of Chicago in 1 year.
