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 O 2. Once the reaction has occurred as completely as possible, what amount (in grams) of the excess reactant is left?
A. 5.28 g ZnS
B. 7.04 g O2
C. 14.08 g O2
D. 15.84 g O2
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