ppm (parts per million ) is a term used in chemistry to show very low concentration.
One gram in one liter denotes 1000ppm solution
i.e. 0.001gm in 1000 ml represent 1ppm
Let's convert this solution first to grams /liter
We have 0.039 grams in 100 ml water
So 0.39 grams in 1000ml water
i.e. 0.39grams per liter
since 1g/l denotes 1000 ppm
So 0.39 grams/ liter= 390 ppm
so this solution has concentration of 390 ppm( parts per million)
I hope this helps if you have any query or want more detailed explanation feel free to ask in the comment section below.
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