We'll look at its mass spectrum to show the sort of problems involved. That reflects the fact that chlorine contains 3 times as much of the 35 Cl isotope as the 37 Cl one. We'll look at its mass spectrum to show the sort of problems involved. The mass spectrum of chlorine Chlorine is taken as typical of elements with more than one atom per molecule. These isotope effects allow you to spot molecules that contain chlorine, because the spectrum of a chlorine-containing molecule will contain a peak that’s two mass units heavier than the molecular ion (M+) and that’s one-third as intense as the M+ peak (see the next figure). Notice that the peak heights are in the ratio of 3 : 1. The Mass Spectrometer In order to measure the characteristics of individual molecules, a mass spectrometer converts them to ions so that they can be moved about and manipulated by external electric and magnetic fields. That reflects the fact that chlorine contains 3 times as much of the 35 Cl isotope as the 37 Cl one. It has two isotopes Cl-35 and Cl-37, so it contain3 atoms of Cl-35 and 1 atom of Cl-37. Chlorine is such an element which contain morethan one atom per molecule. Chlorine has two isotopes, 35 Cl and 37 Cl, in the approximate ratio of 3 atoms of 35 Cl to 1 atom of 37 Cl. The one containing 37 Cl has a relative formula mass of 80 - hence the two lines at m/z = 78 and m/z = 80. Chlorine has two isotopes, 35 Cl and 37 Cl, in the approximate ratio of 3 atoms of 35 Cl to 1 atom of 37 Cl. Cl2+→ Cl + Cl+ The Cl atom is neither accelerated nor deflected in the machine it is not ionized in the ionizatio… The molecular ion containing the 35 Cl isotope has a relative formula mass of 78. The one containing 37 Cl has a relative formula mass of 80 - hence the two lines at m/z = 78 and m/z = 80. 1. You might suppose that the mass spectrum would look like this: You would be wrong! This process is called fragmentation. 100 A) I B) II C) III D) IV 20 none 100 3c 1015 20 25 30 35 :5505500637075 Notice that the peak heights are in the ratio of 3 : 1. That means that there will be 3 times more molecules containing … The problem is that chlorine consists of molecules, not individual atoms. The molecular ion containing the 35 Cl isotope has a relative formula mass of 78. The mass spectrum for 2-chloropropane (C 3 H 7 Cl). 5) Which of the following mass spectra shows the presence of chlorine in a compound? The ions are not stable so some will formchlorine atom and a Cl+ ion. That means that there will be 3 times more molecules containing the lighter … The three essential functions of a mass spectrometer, and the associated components, are: It consist of molecules so when it passedinto the ionization chamber, the electrons are knocked off, and give molecularion, Cl2+.