# 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

🤓 Based on our data, we think this question is relevant for Professor Wojcinski's class at OREGONSTATE.

###### 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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Limiting Reagent concept. If you need more Limiting Reagent practice, you can also practice Limiting Reagent practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofZinc (II) sulfide reacts with oxygen according to the reacti...as medium difficulty.

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What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Wojcinski's class at OREGONSTATE.