The bad smell of water containing hydrogen sulfide

Question

can be removed by the action of chlorine. The reaction
is
H2S(aq) + Cl2(aq)-->2HCl(aq) + S(s)
If the hydrogen sulfide content of contaminated water
is 22 ppm by mass, calculate the amount of Cl2
(in grams) required to remove all the H2S from
2.0 . 10 2+ gallons of water. (1 gallon = 3.785 L.)

Answer 1

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Answer 2

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Answer 3

Convert 2.0E2 gallons to grams. Convert 22 ppm to grams S. Then follow the steps in this link.
http://www.jiskha.com/science/chemistry/stoichiometry.html