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If a solution is 3% H2O2 by mass calculate its molarity. Assume the density is 1 g/mL. How does this molarity compare with the molarity of H2O2?

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jufsanabriasa

Answer:

0.882M of H2O2

Explanation:

A 3% solution by mass of H2O2 is a solution 3g of H2O2 in 100g of solution.

We need to convert the grams of solution to liters and the grams of H2O2 to moles to find molarity:

Moles H2O2:

3g H2O2 * (1mol / 34.01g) = 0.0882 moles H2O2.

Liters of solution:

100g solution * (1mL / 1g) * (1L / 1000mL) = 0.100L

Molarity (Ratio of moles of solute and liters of solution is:

0.0882 moles / L = 0.882M of H2O2

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