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Secure https://session.mastenngchemistry.com/myct/mastering./assignment/5984673 Login MasteringChemistry Chapter 13 Ready-To-Go Teaching Module After Class Expressing Solution Concentration - Gocgle Chrome Secure https://session masteringchemistry.com myct/itemier?assignmenProblemID 94 19697&offset-net; Chapter 13 Ready-To-Go Teaching Module After Class: Expressing Solution Concentration Exercise 13.61 me Constants Periodic Table Part A Household hydrogen peroxide is an aqueous solution containing 3 0% hydrogen peroxide by mass. What is the molarity of this solution? (Assume a density of 1.01 g/mL) Express your answer using two significant figures. tudy Mod terials Submit

Explanation / Answer

The solution has 3.0% hydrogen peroxide by mass

So that means that 100 g of solution has 3.0 g of H2O2

Number of moles of H2O2 = 3.0 / molar mass

= 3.0 / 34.0147 = 0.088 mol

Volume of solution = mass / density

= 100 / 1.01

= 99 mL

Molarity = no. of moles of H2O2 / volume of solution in L

= 0.088 / 0.099

= 0.89 M

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