A 2400. -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?
1. $5.0 ppm$
2. $15 ppm$
3. 20. ppm
4. 50. ppm

Answer

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Answer

$x = 5 ppm$

Steps

Step 1 ： $\frac{0.012 grams {NH}_{3}}{2400 grams solution} \times 10^{6} = x ppm$

Step 2 ： $x = \frac{0.012}{2400} \times 10^{6}$

Step 3 ： $x = 5 ppm$