We’re being asked to **calculate the molarity (M)** of a **hydrogen peroxide (H _{2}O_{2}) solution**.

Recall that ** molarity** is the ratio of the moles of solute and the volume of solution (in liters). In other words:

We’re given the mass percent of H_{2}O_{2} in water, **3.0%**. Recall that ** mass percent** is given by:

This means in **100 g of solution**, we have **3.0 g H _{2}O_{2}**.

**The steps we need to do for this solution are:**

*Step 1:* Calculate the moles of H_{2}O_{2}

*Step 2:* Calculate the volume of the solution (in L).

*Step 3:* Calculate the molarity of the solution.

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.)

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