Question

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.)

Answer 1

Answer: Molarity of this solution is 0.88 M

Step-by-step explanation:

Molarity : It is defined as the number of moles of solute present in one liter of solution.

Formula used :

`Molarity=(n* 1000)/(V_s)`

where,

Given : 3.0 g of hydrogen peroxide is present in 100 g of solution.

n = moles of solute =
`\frac{\text {given mass}}{\text {molar mass}}=(3.0g)/(34g/mol)=0.088mol`

`V_s` = volume of solution in ml=
`\frac{\text {mass of solutuion}}{\text {density of solution}}=(100g)/(1.01g/ml)=99.0ml`

Now put all the given values in the formula of molarity, we get

`Molarity=(0.088moles* 1000)/(99.0ml)=0.88mole/L`

Thus molarity of this solution is 0.88 M