Question

In: Chemistry

The m/z of a singly charged fragment ion was determined to be 587.315 amu. What is...

The m/z of a singly charged fragment ion was determined to be 587.315 amu. What is the most likely composition of this fragment?

C19H43N10O11

C23H37N15O4

C25H39N12O5

C26H45N5O10

Thank you!

Solutions

Expert Solution

m/z is basically mass to charge ratio in mass spectometry. m/z is equal to the mass of the cation divided by the charge of the cation.

m/z= mass of the cation/charge of the cation

In mass spectrometer the charge of the cation formed is mostly +1 hence

m/z= mass of the cation /+1

m/z= mass of the cation

The mass of the molecular ion is equal to the molecular weight of the compound. Therefore the mass-to-charge ratio of the molecular ion is equal to the molecular weight of the compound.

Compound

Molecular weight of the compound

Molecular weight of the singly charged fragment

C19H43N10O11

587.60

411.61

C23H37N15O4

587.64

523.64

C25H39N12O5

587.65

507.66

C26H45N5O10

587.66

427.67

Hence the most likely composition of this fragment is C23H37N15O4.

queen_honey_blossom answered 2 years ago

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