Mass Spectrometry

Question 1

What is molecular ion peak equal to?

Answer 1

Molecular ion peak = Mr of molecular ion

Question 2

What does m/z mean?

Answer 2

Mass / charge

Question 3

What is the value of z usually?

Answer 3

+1

Question 4

If the mass was 46 and the charge was 1 what would the m/z value be?

Answer 4

46 / 1 = 46

Question 5

If the mass was 46 and the charge was 2 what would the m/z value be?

Answer 5

46 / 2 = 23

Question 6

How do peaks occur?

Answer 6

Due to fragmentation

Question 7

How does a higher resolution make it easier to differentiate between compounds?

Answer 7

• makes it easier to differentiate between compounds which give off the same Ar
• The high resolution allows for differentiation due to Ar being calculated to 4 or 5 decimal points