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Electro Chemistry help, please

So... I`m currently struggling with oxidation numbers. Any of you know what`s happening in the green arrowed area?

http://oi62.tinypic.com/vo0p44.jpg

April 6, 2014

3 Comments • Newest first

DistantSky

[quote=RisingRain]H2S only has 1 S, and its oxidation number changes from -2 to 4, which is 6 electrons moved.
O2 has 2 O's, and its oxidation number changes from 0 to -2, which is 2 (2) = 4 electrons moved.[/quote]

why do you multiply the S electron loss by 2 again?

edit: oh nvm im dumb, its cause there are 2 Ses in the reactants and products

Reply April 6, 2014 - edited
Symphs

[quote=RisingRain]H2S only has 1 S, and its oxidation number changes from -2 to 4, which is 6 electrons moved.
O2 has 2 O's, and its oxidation number changes from 0 to -2, which is 2 (2) = 4 electrons moved.[/quote]

Omg, you are godlike. Thank you so much.

Reply April 6, 2014 - edited
RisingRain

H2S only has 1 S, and its oxidation number changes from -2 to 4, which is 6 electrons moved.
O2 has 2 O's, and its oxidation number changes from 0 to -2, which is 2 (2) = 4 electrons moved.

Reply April 6, 2014 - edited