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Q.

A solution of hydrogen peroxide is 15.2% by mass. The solution has a density of 1.01g/mL. What is the molarity of the solution?  

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a

4.95M 

b

3.89M 

c

3.02M 

d

7.12M 

answer is D.

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Detailed Solution

Hydrogen peroxide has a molecular formula of H2O2. 

Use the given density to find the mass of the solution. 

1.00L(1000mL/1L)(1.01g/mL)=1010g 

Next, find the mass of the hydrogen peroxide present in the solution. 

1010g x (0.152) = 153.52g 

Convert the mass of hydrogen peroxide into moles of hydrogen peroxide. 

153.52g of H2O2 x (1 mole H2O2/31.04g H2O2)=4.95 moles of H2O2 

Since we have 1.00L of solution, the molarity is 4.95M. 

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