Please Help Balance this Redox!!

[whitcoatsyndrom]

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Hey Everyone, I cannot figure out how to arrive at the balanced redox reaction from:

FeAsS+ClO2=Fe{+3}+AsO4{-3}+SO4{-2}+Cl{-1} (in acidic solution)

and the answer, as stated on line is:

5FeAsS + 14ClO2 + 36H2O = 5AsO4{3-} + 5Fe{3+} + 14Cl{-} + 5SO4{2-} + 24H3O{+}

My answer was:
8H{+} + 3FeAsS + 14ClO2=3Fe{3+} + 3AsO4{-3} + 3SO4{-2} + 14Cl{-} +4H2O

I got my answer through using the half reaction method and I do not understand why it is not correct. Can anyone help me out?

 

[Rabolisk]

Your answer is not correct because charge is not balanced. You have +8 on the left, and -20 on the right.

 

[whitcoatsyndrom]

Your answer is not correct because charge is not balanced. You have +8 on the left, and -20 on the right.

Yeah I saw that but in order to arrive at the answer I found on line, one needs to entirely disregard 24 or 28 electrons on the products side of the equation. To get their answer I had to multiply one of the half reactions by 5 instead of 3...and when I do that I cannot cancel out all of the charge!

 

[Rabolisk]

I'm not sure what you mean because the correct answer's charge is balanced. I'll do this myself in about an hour and post detailed steps. Meanwhile, I am confident that their answer is right.

 

[whitcoatsyndrom]

thanks a lot, I really appreciate it