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50 mL of '20 V' H2O2 is combined with 200 mL of '10 V' H2O2. What is the volume strength of the resulting mixture?

1. 12V
2. 14V
3. 16V
4. 18V

Correct answer: 12V

Solution

Mixing volumes of different volume strengths gives a volume-weighted average, which here is 12 V.

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