We're being asked to determine the molarity of Zn of an 81% Cu and 19% Zn mixture which has a density of 8760 kg/m^{3}

In this case, follow these steps to *determine the molarity of Zn*

**Step 1**. Determine the mass of 1 L of the brass

**Step 2**. Determine the mass of Zn in this 1 L of brass

**Step 3**. Convert this mass to moles to calculate for the molarity.

**Step 1**. In order for us to calculate the molarity, we need to find the mass of 1 L of this brass using density. Recall that molarity can be solved as:

$\overline{){\mathbf{Molarity}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{moles}\mathbf{}\mathbf{of}\mathbf{}\mathbf{solute}}{\mathbf{L}\mathbf{\hspace{0.17em}}\mathbf{of}\mathbf{}\mathbf{solution}}}$

Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 81.0% Cu and 19.0% Zn by mass has a density of 8760 kg/m^{3} .

What is the molarity of Zn in the solution?

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