Mass Spectrometry
Do now:
Calculate the relative formula masses for:
(without looking back at your notes)
Zinc chloride, ZnCl2
Sulphuric acid, H2SO4
Ethanol, C2H4(OH)2
CH3COONa
C(CH3)4
Calculating average atomic mass
Calculating average atomic mass
How do you calculate it?
6.92amu
10.80amu
24.32amu
28.10amu
52.05amu
Mass Spectrometer
Draw and annotate what is happening on each part of the mass spectrometer
as you watch the video.
Mass Spectrometer
What does a mass spectra look like?
REMINDER - How do you calculate it?
Element
Chlorine
Relative mass of
isotope
35
37
Relative
abundance
3
1
1. Multiply the mass of each isotope by its relative
abundance
2. Add those together
3. Divide by the sum of the relative abundances
R.A.M. =
(35 x 3) + (37 x 1)
3+1
= 35.5
Calculate the RAM of the different isotopes.
What is the element?
A
B
D
C
E
ANSWERS
ANSWERS
Exam question
Exam
question
Self assessment
Self assessment