B. shall determine the concentration in the unit ppb
from formula ppb (mass) = (mass / mass of solute solution) x 10 9
from solving the mass of the melt. = 2 x 10 - 4 mass of solution = 100
instead of ppb (mass) = (2 x 10 - 4 / 100) x 10 9
= 2 000,,
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