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Problem: Zinc (II) sulfide reacts with oxygen according to the reaction: 2 ZnS(s) + 3 O2(g)  → 2 ZnO(s) + 2 SO2(g) A reaction mixture initially contains 4.2 mol ZnS and 6.8 mol O2. Once the reaction has occured as completely as possible, what amount (in moles) of the excess reactant is left? A. 1.5 mol B. 0.5 mol C. 6.3 mol D. 0 mol

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Problem Details

Zinc (II) sulfide reacts with oxygen according to the reaction:

2 ZnS(s) + 3 O2(g)  → 2 ZnO(s) + 2 SO2(g)

A reaction mixture initially contains 4.2 mol ZnS and 6.8 mol O2. Once the reaction has occured as completely as possible, what amount (in moles) of the excess reactant is left?

A. 1.5 mol

B. 0.5 mol

C. 6.3 mol

D. 0 mol