REDOX equation help

[trocha86]

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Hi guys I am having a problem with balancing redox reactions I have no idea how to get what they get I literally just guess and end up guessing the right answer but I want to know how to do it because I feel like its going to come out in my DAT and I dont want to rely on guessing..

Here is an Example:



ANY IDEAS??? THANK YOU!!

ANSWER IS the one with the H2Os

 

[SafetyDog]

Here are the steps by Chad's method:

1) Find oxidation numbers of the main elements that are going to be reduced / oxidized.
2) See how many electrons are being lost or gained per element.
3) Find lowest multiple between amount of electrons being transferred. For example, in the picture I have provided, it is 6. For the transfer of 2 electrons, you want to put a coefficient of 3 to get up to a total of 6 in front of SO2 and H2SO4.
4) Now you have extra oxygens on the product side, so add water on the left side to balance it out.
5) Finally, balance out the right side with H+, but in this case, they didn't include it in the answer.

 

[trocha86]

Here are the steps by Chad's method:

1) Find oxidation numbers of the main elements that are going to be reduced / oxidized.
2) See how many electrons are being lost or gained per element.
3) Find lowest multiple between amount of electrons being transferred. For example, in the picture I have provided, it is 6. For the transfer of 2 electrons, you want to put a coefficient of 3 to get up to a total of 6 in front of SO2 and H2SO4.
4) Now you have extra oxygens on the product side, so add water on the left side to balance it out.
5) Finally, balance out the right side with H+, but in this case, they didn't include it in the answer.

OMG THANK YOU that is super easy!! Im such a DORK lol 👍👍