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Find the percentage strength (w/v) of a '11.2 volume' solution of H2O2. (Molar masses: H = 1, O = 16 g/mol.)

1. 13.6%
2. 3.4%
3. 34%
4. 1.7%

Correct answer: 3.4%

Solution

An 11.2 volume solution is 1 M; multiplying by 34 g/mol and dividing by 10 gives 3.4% w/v.

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