[marco9905]

Hydrogen sulfide (H2S0 is a common and troublesome pollutant in industrial waste waters. One way to remove H2 S is to treat the water with chlorine, in which case the following reaction occurs:
H2S(aq) + CI2 (aq) → S(s) + 2H+(aq) + 2CI-(aq)
The rate of this reaction is first order in each reactant. The rate constant for the disappearance of H2S at 28 degrees celcius is 3.5x10^- 2 M^-1 s^-1.

If at a given time the concentration of H2S is 2.5×10^−4 M and that of Cl2 is 5.5×10^−2 M, what is the rate of formation of Cl-?
Express your answer using two significant figures.

[Borek]

Please read forum rules. You have to try by yourself first.

[marco9905]

I have i got 7.0x10^7 as my answer, but this is wrong,

[Borek]

Show how you got there and someone may be able to find your mistake.