We’re being asked to **calculate the molarity of a solution that contains 17 g of NH _{3} in 0.50 L of solution**.

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

In other words:

$\overline{){\mathbf{Molarity}}{\mathbf{\left(}}{\mathbf{M}}{\mathbf{\right)}}{\mathbf{=}}\frac{\mathbf{moles}\mathbf{}\mathbf{of}\mathbf{}\mathbf{solute}}{\mathbf{Liters}\mathbf{}\mathbf{of}\mathbf{}\mathbf{solution}}}$

**Step 1:** Calculate the moles of NH_{3}.

Mass of NH_{3} **(molar mass of NH _{3})**

What is the molarity of a solution that contains 17 g of NH_{3} in 0.50 L of solution?

A) 34 M

B ) 2.0M

C ) 0.50M

D) 0.029M

E) 1.OM

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