1- On a mass spectrum, the molecular ion has an m/z = 58. What is the name of th
ID: 498952 • Letter: 1
Question
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
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
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
Explanation / Answer
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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