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%.
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