AccurateMassPrelabAnswers

AccurateMassPrelabAnswers - Prelab Questions: 1. What is...

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Prelab Questions: 1. What is the absolute error (in Th) and the relative mass error (in ppm) if the monoisotopic mass of protonated fluoxetine ion (C 17 H 19 F 3 NO) + is predicted without accounting for the electron removed during ionization? (2 pts) 0.00054858 Da is the mass of an electron, thus for a singly charged ion: (0.00054858/310.1413)*10 6 = 1.77 ppm 2. Why might PFTBA and PFK be poor calibrant choices for analyzing air samples containing HFC-134a (Freon 134) refrigerant? (2 pts) (mass spectra of calibrants available at http://www.sisweb.com/index/referenc/mscalibr.htm , look at http://webbook.nist.gov for other mass spectra) Both have ions @ 69 Th, which overlap with a large fragment of HFC134a. Also, HFC-134a is a highly fluorinated compound just like PFTBA and PFK, thus the mass defects for the analyte and calibration ions will not be sufficiently different. There is a distinct danger of them overlapping. 3. What resolving power is required to separate the monoisotopic molecular
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AccurateMassPrelabAnswers - Prelab Questions: 1. What is...

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