Zinc sulfide reacts with oxygen according to the reaction: A reaction mixture initially contains 4.2 mol ZnS

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Zinc sulfide reacts with oxygen according to the reaction:2 ZnS(s) + 3 O(g)  2 ZnO(s) + 2 SO(g)

A reaction mixture initially contains 4.2 mol ZnS and 6.8 mol ∪2. Once the reaction has occurred as completely as possible, what amount (in moles) of the excess reactant remains?

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