We’re being asked to calculate the concentration of NH_{3} in the solution, expressed as parts per million (ppm).

Let’s first define **ppm**.

• **1 ppm means 1 part of solute for every 10 ^{6} parts of the solution**

Can be written as:

$\overline{){\mathbf{ppm}}{\mathbf{=}}\frac{\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{solute}}{\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{solution}}{\mathbf{\times}}{{\mathbf{10}}}^{{\mathbf{6}}}}$

A 2,400-gram sample of an aqueous solution contains 0.012 gram of NH_{3}. What is the concentration of NH_{3} in the solution, expressed as parts per million?

A) 15 ppm

B) 50 ppm

C) 20 ppm

D) 5.0 ppm

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