What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.22.2.1Analyse mass spectra• Analyse mass spectra in terms of m/e values and isotopic abundances (knowledge of the working of the mass spectrometer is not required)Syllabus objective22.2.2The atomic mass of an element• Calculate the relative atomic mass of an element given the relative abundances of its isotopes, or its mass spectrumSyllabus objective22.2.3The molecular mass of an organic molecule• Deduce the molecular mass of an organic molecule from the molecular ion peak in a mass spectrumSyllabus objective22.2.4Suggest the identity of molecules formed• Suggest the identity of molecules formed by simple fragmentation in a given mass spectrumSyllabus objective22.2.5The number of carbon atoms, n, in a compound• Deduce the number of carbon atoms, n, in a compound using the [M + 1]+ peak and the formula n = 100 × abundance of [M + 1]+ ion 1.1 × abundance of M+ ionSyllabus objective22.2.6The presence of bromine and chlorine atoms• Deduce the presence of bromine and chlorine atoms in a compound using the [M + 2] + peakSyllabus objective