Mass spectrometry Question: what are the coordinate axes for a typical mass spec

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Mass spectrometry Question: what are the coordinate axes for a typical mass spectrum? Use of high resolution mass spec to arrive at molecular formulas How can you use mass spec to tell the difference between N2 and Co, both of which have molecular weights of 28? Question Use of isotopic distribution to determine number of carbon or bromine atoms Question: if you think you prepared hexabromocyclohexane, what should you look for in the molecular ion region? Use of the MOLECULAR FORMULA to determine degrees of unsaturation many degrees of unsaturation for strychnine, which has the formula: C21H22N202? Question: howw Use of UV-Vis to quantify molecules with chromophores Question: what are the coordinate axes for a typical UV-visible spectrum? Effect of conjugation on wavelength of UV-Vis spectra which molecule will have the longer wavelength absorption: 2,4,6,8-decatetraene or 2,4,6- octatriene Question:

Explanation / Answer

1. Graph between intensity of signal and m/Z.

2. By observing the peaks at 14 N and and for C13 and O18.

3. Hexabromocyclohexane - C6H6Br6, peak at m/z-558

4. DBE =(21x2+2-2-22)/2=10

5. 2,4,6,8-decatetraene has more wavelength since more conjugation

6. A/C to Beer's Law, C=A/el

C= 0.1/10000x1=1x10-5M

7. Change in dipole moment gives IR active bands

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