12. What is the predicted intensity of the nz 228 peak relative to the MH+ peak (m/z 227)
for pentobarbital from chemical ionization, CIlH'N30s? The isotopic abundances are
13C = 1.08%, 2H = 0.012%, 15N = 0.37%, and 17O = 0.038%.
(A)11.5%; (B)10.7%; (C)6.55%; (D)15.2%; (E) 13.0%.