Answer:
Concentration of Hg = 0.5 ppm
Concentration of Na⁺ = 3.92 × 10⁻⁶ M
Explanation:
The level of Hg is 0.5 mg Hg per kg tissue. What is this level in ppm?
Depending on the context, ppm may refer to mg/kg (ppm in mass) or mg/L(ppm in volume). In this case, we assume it is ppm in mass. Since the level of Hg is 0.5 mg/kg, it is the same as 0.5 ppm.
What is the molarity of Na+ in an aqueous solution containing 333 ppb of NaNO₃?
Depending on the context, ppm may refer to μg/kg (ppb in mass) or μg/L(ppb in volume). In this case, we assume it is ppb in mass. We can find the molarity of Na⁺ (moles of Na⁺ per liter of solution) using proportions.
[tex]333ppbNaNO_{3}=\frac{333\mu gNaNO_{3} }{1L} .\frac{10^{-6}gNaNO_{3} }{1 \mu gNaNO_{3} } .\frac{23.0gNa^{+} }{85.0gNaNO_{3}} .\frac{1molNa^{+}}{23.0gNa^{+} } =3.92 \times 10^{-6} M[/tex]
