Question

Mass Spec

Molecular Weight:

Important Fragments; what are they and what do they mean? (base peak structure, is there a halogen, is there a benzene ring, is there an odd number of nitrogens, other important fragments that tell something about the structure)

positive EI Mass Spectrum 73 100 90 80 Mass of molecularion is 104 what has been lost to see 89? 70 80 50- 40- 89 30- 20 72 10- w 113 14 10 20 30 40 50 80 70 BO 90 100 110 MZ IR spectrum 70 BO MnoBook Pro c G Search or type URL Đ 69 @ 2 # 3 & 4 % 5 > 6 * C 7 9 O TI W E R T Y U 1 o Р S D F G H L K

Answer 1

Question: Answer: Mass Spectroscopy: (MS) is an analytical technique that measures the mass-to-charge ratio of ions. The results are typically presented as a mass spectrum, a plot of intensity as a function of the mass-to-charge ratio. Molecular Weight: Molecular weight is a measure of the sum of the atomic weight values of the atoms in a molecule. Molecular weight is used in chemistry to determine stoichiometry in chemical reactions and equations. Important Fragments; what are they and what do they mean? In mass spectrometry, fragmentation is the dissociation of energetically unstable molecular ions formed from passing the molecules in the ionization chamber of a mass spectrometer. The fragments of a molecule cause a unique pattern in the mass spectrum. These reactions are well documented over the decades and fragmentation pattern is useful to determine the molar weight and structural information of the unknown molecule. Base peak: The most intense (tallest) peak in a mass spectrum, due to the ion with the greatest relative abundance (relative intensity, height of peak along the spectrum's y-axis). The electron impact ionization mass spectrum of given compound, in which the base peak is M having m/z = 73.

positive EI Mass Spectrum 73 100 Mass 90 Base Peak = 73 80- of molecular ion is 104 what has been lost to see 70- 80- 50- 89,? 40- 89 30- 20- 28 Parent ion peak = 104 72 10- 113 14 27 10 20 30 50 80 70 80 90 MZ 100 110 IR spectrum 70- BO (base peak structure, is there a halogen, is there a benzene ring, is there an odd number of nitrogens, other important fragments that tell something about the structure) CH,NIH CI F styrene chlorobenzene phenylmethanamine fhio robenzene Chemical Formula: CHg Chemical Formula: Col Exact Mass: 104.06 Chemical Formula: C,H, Chemical Formula: CHCI Exact Mass: 107.07 Exact Mass: 112.01 Exact Mass: 96.04 The provided mass fragmentation in mass spectrum shows that compound is styrene. The compound does not contain benzene substituted halogen and nitro functional group as mass

e 4 e styrene Chemical Formula: CgHg Exact Mass: 104.06 Chemical Formul: CHE Exact Mass: 89.04 Chemical Formula: C Exact Mass: 73.00 ethane 1,2-döde Exact Mass: 28.03 cycloprqane Exact Mass: 42.05 cyclobutane Exact Mass: 56.06 Thus result indicate that compound is styrene