Mass spectroscopy and Ar calculations
percentage abundance 
95.02 
0.76 
4.22 
Isotopic mass 
32 
33 
34 
2) Boron has 2 isotopes and the
mass spectrum is shown below. Calculate
its relative atomic mass:


3) Lithium has two naturally occurring isotopes ^{6}Li
and ^{7}Li. Calculate the percentage abundance of each isotopes given
that the A_{r} of Lithium is 6.9. Show your working.
4) A specific alloy of bronze has been developed
for use in aircraft due to its high strength and resistance to corrosion.
It is an alloy of two metals and ts mass spectrum is shown below. Identify the two metals in
this bronze and explain why there are three peaks.


5) For the above question,
calculate the relative atomic mass of the element with Isotopes.
Relative abundance 

100 
110 
Isotopic mass 
24 
25 
26 
7) Sketch the mass spectrum you
would likely see for Chlorine molecules
given the following data:
Relative abundance 
3 
1 
Isotopic mass 
35 
37 
8) Mass spectroscopy is a
technique used to determine relative abundancies of isotopes of elements.
a) Briefly explain the stages in mass
spectroscopy:
b) Write an equation showing the ionisation
stage, use M to represent an atom:
c) Write an equation to show what happens at the
detector.