Chemistry / Collecting Gas Over Water
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Solution: Oxygen can be produced in the laboratory by the reaction 2KC...

Question

Oxygen can be produced in the laboratory by the reaction 

2KClO3(s) → 2KCl(s) + 3O2(g) .

How much potassium chlorate is needed to produce 2.75 L of oxygen, collected over water at 37°C and 94.9 kPa? The vapor pressure of water at 37°C is 6.28 kPa.

1. 0.189 mol

2. 9.45 × 10−2 mol

3. 0.142 mol

4. 7.20 × 10−2 mol

5. 6.30 × 10−2 mol