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A hydrogen peroxide solution is labelled as '56.75 volume' and has density 530 g/L. The solution contains only H2O2 and H2O. Which of the following correctly represents the concentration of this solution in another unit?

1. Molarity of H2O2 = 5.066 M
2. % w/v of H2O2 = 30
3. Mole fraction of H2O2 = 0.50
4. Molality of H2O2 = 1000/72

Correct answer: Molarity of H2O2 = 5.066 M

Solution

Volume strength 56.75 gives molarity = 56.75/11.2 = 5.066 M, which is the correct concentration; the other listed values do not match this solution.

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