Analytical chemistry

assignment brief attached please see below for the questions, ive been in hospital so have missed some lessons so im not sure about some of this which is why im asking for help thank you
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Part 1
1) Below is a mass spectrum of an alkane-(General Formula CnH2n+2).
Assessm
Criteria R
3.1
a. What is the mass/charge ratio of the molecular ion and from this work out the molecular
formula of the compound?
b. Draw the 3 possible isomers of this compound.
c. During the process of mass spectrometry the molecular ion has been broken up into several
fragments.
For m/z values of 29, 43 and 57, clearly identify the ions responsible and thus deduce the
possible identity of the isomer.
2) Below is the mass spectrum for methanol.
a. Draw the displayed formula of methanol.
b. The m/z peak at 32 represents the molecular ion. Write the formula of this ion.
c. Allocate fragment ions for the following peaks
31
15
3.2
Part 2
The following table shows the characteristic infrared absorptions in organic molecules. Use
this data to answer the questions below.
wavenumber/cm–1
1000–1300
O- H
location
alcohols, esters, carboxylic
acids
aldehydes, ketones,
carboxylic acids, esters,
amides
organic compound with a C
H bond
carboxylic acids
N -H
amines, amides
3200–3500
O- H
alcohols, phenols
3200–3550 (broad)
bond
C- O
C= O
C- H
1640–1750
2850–3100
2500–3300 (very broad)
Below are 2 different infrared spectra- one of them is for ethyl ethanoate and the other is for ethanoic
acid.
a Draw the displayed formulae of the 2 molecules.
b Identify which spectrum represents which compound
c. Identify the absorptions at A, B, C and D to back up your answer to (b).
2.1
Spectrum 1
A
B
Spectrum 2
C
D
Part 3
a) Below are 3 spectra produced using HPLC. Spectrum A contains a mixture of reference
standards, use these standards to identify the compounds present in in spectra B and C
1.1
b) Use the relative peak areas from the spectrum below to assign each peak a percentage
composition of the mixture.
LO/AC Ref
Level Three criteria applied to this assignment*
1. Be able to interpret 1.1 Employ retention times/Rf values combined with
liquid and gas
peak areas to identify the identity of compounds and
chromatography
their relative proportions in a mixture.
(LC/GC)
chromatograms.
2. Be able to use
infrared
spectroscopy (IR)
spectra to identify
organic molecules.
2.1 Employ typical infrared absorption frequencies for
O–H bond C=O bond to identify alcohols, carbonyls,
carboxylic acids and esters.
3. Be able to use
mass spectrometry
(MS) to identify
unknown organic
molecules.
3.1 Use a mass spectrum of an organic compound to
identify the molecular ion peak and hence to determine
molecular mass.
Tick if
achieved
3.2 Employ the formation of fragment ions as a tool for
confirming organic structures from molecular formulae.
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