NMR

Question 1

The intensity of a total ion chromatogram (TIC) is_____________

Answer 1

The sum of all intensities from the spectrum

Question 2

The intensity of a base peak chromatogram (BPC) is_____________

Answer 2

The highest intensity from the spectrum

Question 3

The intensity of an extracted ion chromatogram (EIC) is_____________

Answer 3

The intensity of a chosen mass from the spectrum

Question 4

Write the formula to calculate the mass to charged ratio (m/z) using ESI-MS

Answer 4

(M+n*X)/n

Question 5

Calculate the m/z value of a compound with the monoisotopic mass 625.3814 charged with 2 protons

Answer 5

Brug formel: (M+nX)/n
og bestemmes til 313.699 ved indsætning af:
(625.3814+21.0078)/2=313.699

Question 6

When you want to predict a chemical formula from MS data, it is extremely important to have an accurate measurement. A precission at the third decimal or better is preferred. Why?

Answer 6

Many compounds share the same nominal mass, but differ slightly on the exact mass