1- On a mass spectrum, the molecular ion has an m/z = 58. What is the...

1- On a mass spectrum, the molecular ion has an m/z = 58. What is the name of the peak at m/z = 59?

Select one:

a. molecular ion

b. M+1

c. M+2

d. A peak has no name.

2-Assume a molecule has an even value of m/z for its molecular ion. Choose all of the possible numbers of nitrogens this molecule may contain.

Select one or more:

a. 2

b. 1

c. 4

d. 0

e. 3

Solutions

Expert Solution

1- On a mass spectrum, the molecular ion has an m/z = 58. What is the name of the peak at m/z = 59?

Answer: b. M+1

Molecular ion is at m/z 58 , the M+1 will be at 58+1=59 only.

2 - Assume a molecule has an even value of m/z for its molecular ion. Choose all of the possible numbers of nitrogens this molecule may contain.

Answer: a.2, c.4 and d.0 (3 answers are correct)

This rule is called as "Nitrogen Rule", according to which The Nitrogen Rule states that if m/z for M is odd, then the molecular formula must have an odd number of nitrogens. If m/z for M is even, then the molecular formula must have an even number of nitrogens (this includes 0).

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queen_honey_blossom answered 1 year ago

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