Zinc, copper, lead, and mercury ions are toxic to Atlantic salmon at concentrations of 6.42 times 10 to the -2 mM, 7.16 times 10 to the -3 mM, 0.965 mM, and 5.00 times 10 to the -2 mM, respectively. What are the corresponding concentration is milligrams per liter?

Question

Zinc, copper, lead, and mercury ions are toxic to Atlantic salmon at concentrations of 6.42 times 10 to the -2 mM, 7.16 times 10 to the -3 mM, 0.965 mM, and 5.00 times 10 to the -2 mM, respectively. What are the corresponding concentration is milligrams per liter?
 A. Concentrations of zinc 
B. Concentration of copper 
C. Concentration of lead 
D. Concentration of mercury

DrBob222 · Answer

Zn = 6.42E-2 mM = 0.0642 mM = 0.0000642 M = 0.0000642 mols/L. grams = mols x atomic mass which gives you grams/L and that x 1000 converts to mg/L.