The level of mercury in a stream was suspected to be above the minimum considered safe (1part per million by weight). an analysis indicated that the concentration was 0.68 parts per million .assume a density of 1.0 g/ml and calculate the molarity of mercury is the stream.

Explanation:

It is given that there are 0.68 parts per million of mercury in the given stream.

This means that there are 0.68 mg of mass of mercury is present in mg of solution.

So, volume of solution will be calculated as follows.

              Density =

                   1 g/ml =

                 volume =   (as 1 mg = 0.001 g)

As 1 ml = 0.001 L. So, will be equal to .

So, mass of mercury present in the stream = 0.68 ppm

                                                                      = g

Molar mass of mercury is 200 g/mol. As we know that,

           No. of moles =

                                 =

                                 = mol

Therefore, we will calculate the molarity of mercury as follows.

                Molarity =

                              =

                              =

Thus, molarity of mercury in the stream is .

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explanation: