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Problem: 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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Problem Details

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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