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02-26-2008, 04:46 PM
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| How do you do a crisscross on formulas for chemistry?? for example Fe2o3 what is the reverse criss cross?? Theres 2 ways theres the obvious way when you say Fe=3 and O=2(because you just did the criss cross backwards) i know that way, but it doesn't always work Whats the way that always works? I'm pretty sure you multiply -2 by 3 and -6 (because Oxygens charge is -2 and iron has 2 different charges) so how do you find iron charge???? thanks in advance:]      |
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