Asked Dec 27, 2019

A low-resolution mass spectrum of the neurotransmitter dopamine gave a molecular ion at m/z = 153. Two possible molecular formulas for this molecular ion are C8H11NO2 and C7H11N3O. A high-resolution mass spectrum provided an exact mass at 153.0680. Which of the possible molecular formulas is the correct one?



Expert Answer

Step 1

A low resolution mass spectra gives the molecular mass of a compound to the nearest whole number.

A high resolution mass spectra gives the exact molecular mass of a compound.

The exact molecular mass of carbon, hydrogen, oxygen and nitrogen are :

Chemistry homework question answer, step 1, image 1
Step 2

The molecular mass of C8H11NO2 and C7H11N3O can be calcula...

Chemistry homework question answer, step 2, image 1

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