Mass spectra an IR
- Created by: danni :)
- Created on: 29-05-13 12:03
Other questions in this quiz
2. Bromine exists as two isotopes, 79Br and 81Br in equal amounts and so has a molar mass of 80 g mol–1. How many major molecular ion peaks are there in the mass spectrum of CH2Br2?
- 3
- 4
- 2
- 1
3. Deuterium oxide is water that contains the stable hydrogen isotope 2H, usually shown as D. When dissolved in deuterium oxide, ethanol undergoes the following reaction: CH3CH2OH + D2O → CH3CH2OD + HOD The best way of showing this reaction has occured
- is by testing the product with phosphorus pentachloride and not getting steamy fumes
- is by determining the mass spectrum of the mixture and showing peaks at m/e values of 19 and 47
- is by determining the mass spectrum of the mixture and showing peaks at m/e values of 20 and 46
- is by fractionally distilling the mixture and determining the amount of CH3CH2OD using a Geiger counter
4. molecules that absorb IR
- have bonds that can change polarity
- have non-polar bonds
5. Which of the following equations for the fragmentation of ethanol, CH3CH2OH, caused by collision with a high-energy electron, e−, would give a peak at m/e = 15 in its mass spectrum?
- CH3CH2OH → CH3• + ·•CH2OH
- CH3CH2OH + e− → CH3• + +CH2OH + 2e−
- CH3CH2OH + e− → CH3+ + •CH2OH + 2e−
- CH3CH2OH → CH3+ + +CH2OH + 2e−
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