During the mass spectrometry analysis of a hydrolyzed protein sample, a biochemist isolates a pure sample of an acidic amino acid. This amino acid can be represented by the general structural formula:
H2N−[R]−COOH \text{H}_2\text{N} - \text{[R]} - \text{COOH} H2N−[R]−COOHwhere [R]\text{[R]}[R] represents the variable central section of the molecule.
The relative formula mass (MrM_rMr) of this amino acid is 147.
Calculate the relative formula mass of the section represented by [R]\text{[R]}[R].
Relative atomic masses (ArA_rAr):
H=1C=12N=14O=16 \text{H} = 1 \quad \text{C} = 12 \quad \text{N} = 14 \quad \text{O} = 16 H=1C=12N=14O=16