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Chapter 22: Q2TY (page 566)

A compound with a molecular ion at m/z 117 has a peak at m/z 118 with a relative intensity of 9.3%. Is there an odd or even number of N atoms? How many carbons are in the formula?

Short Answer

Expert verified

Odd 8C, It cannot be 9C because C9N would be at m/z .122.

Step by step solution

01

data given in question:

The m/z 118 peak has 9.3% of the height of the m/z 117 peak. Table 22-2 tells us that n carbon atoms will contribute n脳1.08%intensity

02

calculating:

Number of C atoms = overservedpeakintensityforM+1contributionpercarbonatom=9.3%1.08%=8.611鈮�8

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Most popular questions from this chapter

35: What are the differences between a reconstructed total ion chromatogram, an extracted ion chromatogram, and a selected ion chromatogram?

34: What is collisionally activated dissociation? At what points in a mass spectrometer does it occur?

Quantitative analysis by selected ion monitoring. Caffeine in beverages and urine can be measured by adding caffeine- D3as an internal standard and using selected ion monitoring to measure each compound by gas chromatography. The figure shows mass chromatograms of caffeine (m/z,194)and caffeine-DD3(m-z.197), which have nearly the same retention time.

Suppose that the following data were obtained for standard mixtures:

(a) Compute the mean response factor in the equation

role="math" localid="1664874599903" AreaofanalytesignalAreaofstandardsingle=F(concentrationofanalyteconcentrationofstandard)

(b) For analysis of a cola beverage, 1.000mL of beverage was treated with 50.0渭尝of standard solution containing 1.11 g/Lcaffeine-D3 in methanol. The combined solution was passed through a solid-phase extraction cartridge that retains caffeine. Polar solutes were washed off with water. Then the caffeine was washed off the cartridge with an organic solvent and the solvent was evaporated to dryness. The residue was dissolved in50渭尝 of methanol for gas chromatography. Peak areas were 1144 for m/z197 and 1733 for m/z194. Find the concentration of caffeine (mg/L ) in the beverage.

What is selected reaction monitoring? Why is it also called MS/MS? Why does it improve the signal-to-noise ratio for a particular analyte?

Measure the resolving power m/m1/2from the 31Ppeak in Figure 22 10.
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