A2400.-gram sample of an aqueous solution contains 0.012 gram of nh3. what is the concentration of nh3 in the solution, expressed as parts per million?

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The concentration of NH₃ in the solution, expressed in parts per million is 5 ppm. 

To calculate the concentration of a substance in parts per million, one first must keep in mind the definition of parts per million concentration unit:



With this definition of parts per million one can calculate the concentration of NH₃, using the following conversion factor to go from grams of NH₃/grams of sample to milligrams of NH₃/kg of sample:



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The concentration (in ppm) of NH₃ in the solution is 5 ppm.

From the question given above, the following data were obtained:

Mass of solute (NH₃) = 0.012 gMass of solution = 2400 gConcentration (ppm) =?

Concentration of the solution in ppm can be obtained as follow:

Concentration = (mass of solute / mass of solution) × 10⁶

Concentration = (0.012/2400) × 10⁶

Concentration = 5 ppm

Therefore, the concentration of the solution in ppm is 5 ppm

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And a) oxygen i believe