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  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 t he m/e ratio of the isotopes are also given in the mass spectrums. Calculate the relative atomic mass of each element.