MASS SPECTROMETRY (MS)Exercise 1:Determine the degree of unsaturation (IHD) for the hydrocarbons with the following molecularformulas:(a) C10H16HDI 3(b) C7H7NOHDI 5(c) C8H9ClOHDI 4Exercise 2:An unknown substance shows a molecular ion peak at m/z 170 with a relative intensity of 100.The M 1 peak has an intensity of 13.2, and the M 2 peak has an intensity of 1.00. What is themolecular formula of the unknown?M at m/z 170M peakM 1 peakM 2 peakimplies an even # of nitrogenit is the base peak, no recalculation necessary13.2 / 1.1 12; 12 carbons1.00% of M ; no S, Cl, Br170 – (12)(12) 26cannot have two NM 2 peak170 – (12)(12) – 16 10C12H26 is possibleMM exceededits presence might indicate oxygenC12H10Oanswer: C12H10O (or C12H26)Exercise 3:An unknown hydrocarbon has a molecular ion peak at m/z 84, with a relative intensity of 31.3.The M 1 peak has a relative intensity of 2.06, and the M 2 peak has a relative intensity of 0.08. Whatis the molecular formula for this substance?M at m/z 84M peakM 31.3M 12.06M 20.0884 – (6)(12) 12implies an even # of nitrogenit is not the base peak, recalculation necessary100%6.58%6.58 / 1.1 5.98; 6 carbons0.25%no S, Cl, Branswer: C6H12Page 1
Exercise 4:An unknown substance has a molecular ion peak at m/z 107, with a relative intensity of 100. Therelative intensity of the M 1 peak is 8.00, and the relative intensity of the M 2 peak is 0.30. What isthe molecular formula for this unknown?M at m/z 107implies an odd # of nitrogenM peakit is the base peak, no recalculation necessaryM 1 peak8.00 / 1.1 7.3; 7 carbonsM 2 peak0.30%; no S, Cl, Br107 – (1)(14) – (7)(12) 9answer: C7H9NExercise 5:The mass spectral data of an unknown liquid are given below. What is the molecular formula of thisunknown?M at m/z 78M peakM 23.6M 10.79M 27.5578 – (3)(12) – 35 7implies an even # of nitrogenit is not the base peak, recalculation necessary100%3.35%3.35 / 1.1 3.05; 3 carbons32%Cl is presentanswer: C3H7ClExercise 6:Propose a molecular formula for each mass spectrum:Page 2
Exercise 7:Look at the mass spectrum of 2-methylhexane. What is the m/z value of the M peak and of the basepeak? Give possible structures of the fragments giving rise to the large peaks at m/z 85, 57, and 43.M peakm/z 100base peakm/z 43Page 3
Exercise 8:Give the structure of the molecule that gives the following mass spectrum.Exercise 9:The mass spectra of heptane and 2,2,3-trimethylbutane are given below. Which spectrum representswhich compound? Explain.Page 4
Exercise 10:Propose a structure for the compound having the following mass spectrum:(a)(b)Page 5
MASS S PECTROMETRY (MS) Exercise 1: Determine the degree of unsaturation (IHD) for the hydrocarbons with the following molecular formulas: (a) C10 H16 HDI 3 (b)C7H7NO HDI 5 (c) C8H9ClO HDI 4 Exercise 2: An unknown substance shows a molecular ion peak at m/z 170 with a relative intensity of 100. The M 1 peak has an intensity of 13.2, and the M 2 peak has an intensity of 1.00.
Create Your Own PCB with a Laserjet Printer! This weekend I teamed up with Xander Hudson to show how you can make your own printed circuit board (PCB)! ItÕs a fun way to create your own circuit over the weekend. To do this project, Xander started by designing it in Eagle CAD, a program stocked with
Nov 01, 2014 · Chaldean Catholic Church Mass Schedule SATURDAY VIGIL: 6:00pm Ramsha, Evening Prayer 6:30pm Mass in English SUNDAY MASS: 8:00am Sapra, Morning Prayer 8:30am Holy Mass in Chaldean 10:00am Holy Mass in Arabic 11:30am Holy Mass in English 1:15pm Holy Mass in Chaldean 7:30pm Holy Mass in English DAILY MASS: MONDAY THRU FRIDAY
Mass of Christ the Savior (Schutte) Mass of Creation (Haugen) MASS SETTINGS, cont. Mass of Glory (Canedo/Hurd) (Stephan) Mass of Spirit and Grace (Manalo) Mass of St. Frances Cabrini (Keil) Mass of St. Paul the Apostle (Walker) Mass of the Resurrection (DeBruyn) Misa Santa Fe (Reza) ADDITIONAL SERVICE MUSIC NEW MUSIC Liturgical Year 2018 GUITAR .
Chemical Reactions, and Stoichiometry Section 2.1: The Atomic Mass The atomic mass is the mass of 1 atom. Atoms are very small and their mass is a . molecular or ionic compound. The formula mass is expressed in a.m.u. Molar mass is the sum of atomic masses of all atoms in a mole of pure substance. The molar mass is expressed in g/mol.
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existing mass families (Place Mass) or create in place masses (Create Mass). Using either tool the first thing you'll see is a dialog box indicating that Revit has activated the Show Mass mode. Mass visibility is controlled in the following ways: The Show Mass button on the View toolbar toggles mass visibility on and off in all views
Sample Paper – Accountancy (2020-21) General Instructions: 1. This question paper comprises two Parts – A and B.There are 32 questions in the question paper. All questions are compulsory. 2. Part A is compulsory for all candidates. 3. Part B has two options i.e. (1) Analysis of Financial Statements and (2) Computerized Accounting. You have to attempt only one of the given options.