FeO + Cu = . ??? What is the product of this chemical reaction ?

No reaction, because Cu is more electropostive than Fe (i.e higher electronegativity and more noble.

so Cu can't be oxidized by Fe.

No Reaction occur due to less reactivity 

I dont think the reaction will occur because copper is less reactive than iron

All what I found is:

2 Cu3FeS3(s) + 7 O2(g) = 6 Cu(s) + 2 FeO(s) + 6 SO2(g) occuring with more than 80% yeld.

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