Solution: 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 occu

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

2 ZnS_(s) + 3 O_2(g)  → 2 ZnO_(s) + 2 SO_2(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