Question

The bad smell of water containing hydrogen sulfide
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

I have removed your other 13 posts. You are welcome to post again, but be sure you include what you know about each question so far and what your SPECIFIC QUESTION is.

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