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explain in short terms the following vocab: exact mass, elemental analysis, mass spectrometry and their applications
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- Give an overview of the method of mass spectrometry and how it works.How does NIST allow for chemical compound data to be readily accessible.Discuss the following general steps in gravimetric analysis. Sample solution Preparation Precipitation Digestion Filtration and Washing Drying and igniting Weighing and then calculation.
- Given the following mass spec data, what is the molecular formula of the compound? (Show pertinent calculations on your submitted work.) Mass Intensity 104 (M+) 19.8 105 1.09 106 0.833.a. How can you differentiate the association or condensation method with disintegration or dispersion method for the preparation of particles with nano dimensions? Explain with suitable examples.(3) HBr
- 14. Shown below are the mass spectra (without data tables) of four molecules. (The structure of each molecule is shown on the spectrum.) Mark the [M] peak for each, and indicate the molecular weight of the molecule. Relative Intensity Relative Intensity 100 80 60 40- 20 0-mm 10 100- 80 a. 20- 115-14-5501 0-mm 10 20 b. =0 20 30 30 40 40 50 50 60 m/z 60 m/z 70 70 80 80 90 100 90 100 Relative Intensity Relative Intensity 100- 80 40 20 0 100 80 40 10 20- 15-NU-5580 15 20 25 115--555 ont 10 20 30 30 35 40 45 50 55 m/z 40 50 m/z 60 60 70 65 70 75 80 Based on the five mass spectra you have seen, describe how one might identify the [M]* peak (molecular ion peak) on the mass spectrum of an unknown compound.2. Balance the following equations by supplying the lowest whole numbers for w, x, y, and z: (a) w S8 + x Cl₂ → y S₂Cl₂ (b) w C3H8O + x O₂ → y CO₂ + z H₂O (c) w Fe + x H₂O → y Fe₂O3 + z H₂The formula of the hydrate of magnesium sulfate was determined (M9SO4.XH20) and the following data was obtained. Mass of crucible + lid + unknown 6.0236 g Mass of crucible + lid 4.0002 g Mass of unknown hydrate Mass of crucible + lid + residue: after 1 st heating 5.0842 g after 2 nd heating 5.0426g after 3 rdheating 5.0339g Mass of water lost Mass of anhydrous salt Percent Water in unknown hydrate Moles of water in hydrate sample Moles of anhydrous salt in hydrate sample Calculated Mole ratio(H2O: salt)_ Complete formula of the hydrate
- What is the molar mass of ginkgolide B (C 20H 24O 10), a complex compound isolated from the ginkgo tree? Extracts of the roots, bark, and seeds of the ginkgo tree comprise the most widely taken herbal supplements used today.The spectroscopic data in the table is generated with five solutions of known concentration. Concentration (M) 0.0179 0.0358 0.0716 0.143 0.286 Absorbance 0.1425 0.1896 0.5722 1.126 2.1102clar ISTRY EXAM A Chemistry student performed an experiment on the preparation and identification of an ester. He was given solutions of a carboxylic acid and an alcohol. He then prepared the ester as per laboratory instruction and identified the odour of the ester as a pear flavour. A carboxylic acid has empirical formula CH,O, and its structure is determined by using various spectroscopic techniques. (a) The mass spectrum for this carboxylic acid molecule is given below. 100- 80- 60- relative intensity 40- 20- 10 15 20 25 30 35 40 45 50 55 60 65 70 75 mass/charge (m/e) (i) State the relative molecular mass of this molecule; hence determine its molecular formula. (ii) Draw the structural formula of the carboxylic acid and give its systematic name. ark (b) Use the information provided by its Infrared spectrum below to answer the following questions 100