Question a. A method of ionizing samples in time-of-flight mass spectrometry (TOF/MS) is by electrospray ionization (ESI

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Question A A Method Of Ionizing Samples In Time Of Flight Mass Spectrometry Tof Ms Is By Electrospray Ionization Esi 1 (127.3 KiB) Viewed 44 times

Question a. A method of ionizing samples in time-of-flight mass spectrometry (TOF/MS) is by electrospray ionization (ESI). Explain how is this ionization done? b. Time-of-Flight (TOF) is a mass analyser that measures the time each ion takes to reach the detector. Explain why different ions take different times to travel through the flight tube. c. Which of these ions will reach the detector first in TOF/MS? Explain your answer in each case. 204Pb+ or 208Pb+ 11. 12CH3NO+ or 13CH3NO+ d. The mass spectrum of an aromatic organic compound "Z" with a molecular formula of C7H7NO is shown in Figure 4. Answer the following questions: of Base Peak 100 8 r18 281 Ittigerathyam 20 40 50 60 m/ 1057 80 M UNIVERSITI TEKNOLOGI MALAY 121 ghter 90 100 110 120 Figure 4: Mass spectrum of an aromatic organic compound "Z". Identify the molecular ion by stating the m/z value and predict the structure of the molecule "Z" based on the information provided. Draw the fragmentation pathway of the molecule "Z" by drawing the fragment ions of m/z 105, 77, and 44. e. Caffeine has a molar mass of 194.19 g/mol, determined by mass spectrometry, and contains C, N, H, O. What is a molecular formula for this molecule?