Answer Happy

201 - Understand molecular structure through interpretation of low resolution mass spectra. AC 1.1 Outline the functions of the main parts of a time of flight mass spectrometer. AC 1.2 Interpret mass spectra to propose the structure of organic molecules. 1. Use a labelled diagram to explain the principles of a simple time of flight mass spectrometer. 2. Below is the mass spectrum for pentane (C5H10); 43 100% 11 Relative abundance 29 57 72 10 20 30 40 70 80 90 100 50 60 m/z i) in) Identify the m/z of the molecular ion and base peaks Suggest possible fragment ions responsible for the identified peaks. 3. A hydrocarbon, C4H10 generates a mass spectrum with peaks at m/z values of 58, 43, 29 and 15. Identify the ions that would give rise to these peaks. ii) Draw skeletal formulae of the two possible structural isomers for this molecule. Explain which isomer would produce this spectrum.