Question

How do we determine molar concentrations from concentrations that are reported in `"ppm"`?

Answer 1

`"1 ppm"` `=` `1*mg*L^-1`

Explanation:

When we deal in `"ppm"` concentrations, typically the solute is so dilute, that the density of the solution does not change very much from that of water, i.e. `1*g*mL^-1`.

Now your solution was prepared by taking a volume of solute, and dissolving this in another volume of solvent. Was it water? I don't know. And thus we cannot address your question; there are insufficient data.