(adsbygoogle = window.adsbygoogle || []).push({}); balancin an equation!!!

hello everybody,

i just got back from my chemistry class, with some homework...

it s about balancin equations (hard ones) and they are relating to the lesson of oxidation-reduction...

here is one of them that i have to balance--

if someone can show me the steps to take, that would be awesome :) because i have like 5 more to do...

Al + H2SO4 --> Al 3+ + SO4 2- + SO2 + H2O

thank you :)

oh yeah, the problem in this equation is that i have SO4 2- and SO2

so to determine the number of oxydation for S

should it be -8 or -4 ==> should i use SO4 -2 or SO2

when i know what to use, i ll see the change of this number, then what ?

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# Homework Help: Balancin an equation

**Physics Forums | Science Articles, Homework Help, Discussion**