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What volume of 20-volume hydrogen peroxide is needed to produce 5 L of oxygen gas at STP?

1. 250 mL
2. 125 mL
3. 100 mL
4. 50 mL

Correct answer: 250 mL

Solution

To make 5000 mL O2 you need 5000/20 = 250 mL of 20-volume H2O2. Stored 125 mL is wrong.

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