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Predicting reactions (chemistry)

T

thirtythree

Diamond Member
I'm doing this review packet for AP chemistry and I can't figure this equation out.

Sulfur trioxide is added to chromium(III) oxide.
So I have SO3+Cr203-->?

At the top of this section it gives the general equation metal oxide+nonmetal oxide-->salt and says there is no change in oxidation number .. so I'm really confused. Am I missing something?
 
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