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1) Consider the following substance: V3N5. What is the oxidation number of vanadium and nitrogen?

2) Consider the following substance: Mn2O7. What is the oxadation number of manganese and oxygen?

3) Consider the following reaction:
Al2(SO4)3. What is the oxidation number of aluminum, sulfur and oxygen?

2 answers

I would call V +5 and N -3.
Mn is +7 and oxygen is -2.
Here is a good web site.
http://www.chemteam.info/Redox/Redox-Rules.html
What is the oxidation numbers for ammonia
2NH3
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