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April 21, 2014

Homework Help: Chemistry - Please check

Posted by Alex on Wednesday, February 13, 2008 at 4:38pm.

d) 2Al(s) + Fe2O3(s)  2Fe(l) + Al2O3(s)
Oxidation
2Al(s)  2Al+ + 2e-
Reduction
Fe23+ + 3e-  2Fe(l)

Oxidation numbers for chlorine
HCl = -1
MnO2(s)= +4
KMnO4(s)= +7

Oxidation numbers for manganese
Mn(s)= ?
MnCl2(s)= +7
Mn2+(aq)= ?
MnO4- =?

And then SO4 is so confusing...
H2SO4 =?
PbSO4 = ?

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