In the st. louis river, fish tissues have been found to exceed the 0.5 mg hg per kg tissue criterion set up to protect food webs (higher trophic level fish, birds, etc). what is this level in ppm? what is the molarity of na+ in an aqueous solution containing 333 ppb of nano3?

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.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-