Question

1) A compound has the chemical formula C8H15Br. The M+ peak should be at m/z = ____ and there should also be an M+1 peak at m/z = ____ and an M+2 peak at m/z =____ . If the height of the M+ peak is 50, the height of the M+1 peak should be ____ and the height of the M+2 peak should be approximately ____. A compound has the chemical formula C5H11Cl. The M+ peak should be at m/z = ____ and there should also be an M+1 peak at m/z = ____ and an M+2 peak at m/z = ____. If the height of the M+ peak is 27, the height of the M+1 peak should be ____ and the height of the M+2 peak should be approximately____ .

Answer 1

Question: A compound has a chemical formula C8H15Br.

The M+ ion should be the at m/z =   and there should also be an M + 1 peak at m/z=    and an M + 2 peak at m/z=   .

If the height of M+ peak is 50, the height of the M + 1 should be     and the height of the M + 2 should be approximately .

Solution:

Sometion : Ginen chemical formula = Ca H15 Br MW Molecular weight of compound = [no. of atoms x atomic weight of atom). [ccexla) + H(1541) + Br (1x 70)] MW - 190, M M't at e = > m/2 of Mt peak is 190 / of Mti 190 care to IBC isotope) my of Mta = 192 (due to (due to & Br isotope). ryt m 1 m/ 190 Mal m/ 191 Mt2 m/2 5192 CSScanned with CamScanner

50 % If af Height of nut is Mtl and M+2 should =? M+1 peak is due to be isotope. 13c is Hly. abundance of total carbons ch com mpound 8. S of / S x 119 5) height of M+i peak is 8.8% Mta peak is due to By Kolope and 8 By Isalopes are abundance of TO BE 2. ration 50.3 49.7 7. There for a peak due to t9Br and 8 Br are always in equal height. height of Mta peak is 50% CSScanned with CamScanner