High concentrations of ammonia (NH3), nitrite ion, and nitrate ion in water can kill fish. Lethal concentrations of these species for rainbow trout are approximately 1.002 mg/L, 0.412 mg/L, and 1352.2 mg/L, respectively. Express these concentrations in molality units, assuming a solution density of 1.00 g/mL. a. m ammoniab. m nitrite ironc. m nitrate ion

Explanation:

It is known that molality is the number of moles present in kg of solution.

Mathematically,  Molality =

The given data is as follows.

Molar mass of ammonia = 17 g/mol

Concentration = 1.002 mg/L =

                        = mol/L

Also,    density = = 1 kg/L

Therefore, molality will be calculated as follows.

        Molality =

                      =

And,

Molar mass of nitrite = 46 g/mol

Concentration = 0.387 mg/L =

                        = mol/L

And, density = = 1 kg/L

Hence, molality =

                          = mol/kg  

Now, Molar mass of nitarte = 62 g/mol

      Concentration = 1352.2 mg/L

                              =

                              = 0.02181 mol/L

Also, density = = 1 kg/L

Hence, molality will be calculated as follows.

         Molality =

                       = 0.02181 mol/kg

Therefore, molality of given species is  for ammonia, mol/kg  for nitrite, and 0.02181 mol/kg for nitrate ion.

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