The mass of spectrum of lead is given below. Determine the relative atomic mass of lead.

 PROBLEM:

            The mass of spectrum of lead is given below. Determine the relative atomic mass of lead.

SOLUTION:

            Relative atomic mass of lead = (206x1/4) + (208x2/4)

                                                             = 51.50 + 51.75 + 104.00   

 = 207.25

Problem:

The mass spectrums of Zirconium, Iron and Strantium are given. The height of the peaks and the m/e ratio of the isotopes are also given in the mass spectrums. Calculate the relative atomic mass of each element.