1. Alanine has molecular formula: C3H7NO2 Molecular weight = 3 x atomic mass of C + 7 x atomic mass of H + 1 x atomic mass of N + 2 x atomic mass of O = 3 x 12.01 + 7 x 1.008 + 1 x 14.01 + 2 x 16.00 = 89.1 g/mol 2. Arginine has molecular formula: C6H14N4O2 Molecular weight = 6 x atomic mass of C + 14 x atomic mass of H + 4 x atomic mass of N + 2 x atomic mass of O = 6 x 12.01 + 14 x 1.008 + 4 x 14.01 + 2 x 16.00 = 174.2 g/mol 3. Phenylalanine has molecular formula: C9H11NO2 Molecular weight = 9 x atomic mass of C + 11 x atomic mass of H + 1 x atomic mass of N + 2 x atomic mass of O = 9 x 12.01 + 11 x 1.008 + 1 x 14.01 + 2 x 16.00 = 165.2 g/mol 4. Tryptophan has molecular formula: C11H12N2O2 Molecular weight = 11 x atomic mass of C + 12 x atomic mass of H + 2 x atomic mass of N + 2 x atomic mass of O = 11 x 12.01 + 12 x 1.008 + 2 x 14.01 + 2 x 16.00 = 204.2 g/mol 5. Methionine has molecular formula: C5H11NO2S Molecular weight = 5 x atomic mass of C + 11 x atomic mass of H + 1 x atomic mass of N + 2 x atomic mass of O + 1 x atomic mass of S = 5 x 12.01 + 11 x 1.008 + 1 x 14.01 + 2 x 16.00 + 1 x 32.07 = 149.2 g/mol Solution 1. Alanine has molecular formula: C3H7NO2 Molecular weight = 3 x atomic mass of C + 7 x atomic mass of H + 1 x atomic mass of N + 2 x atomic mass of O = 3 x 12.01 + 7 x 1.008 + 1 x 14.01 + 2 x 16.00 = 89.1 g/mol 2. Arginine has molecular formula: C6H14N4O2 Molecular weight = 6 x atomic mass of C + 14 x atomic mass of H + 4 x atomic mass of N + 2 x atomic mass of O = 6 x 12.01 + 14 x 1.008 + 4 x 14.01 + 2 x 16.00 = 174.2 g/mol 3. Phenylalanine has molecular formula: C9H11NO2 Molecular weight = 9 x atomic mass of C + 11 x atomic mass of H + 1 x atomic mass of N + 2 x atomic mass of O = 9 x 12.01 + 11 x 1.008 + 1 x 14.01 + 2 x 16.00 = 165.2 g/mol 4. Tryptophan has molecular formula: C11H12N2O2 Molecular weight = 11 x atomic mass of C + 12 x atomic mass of H + 2 x atomic mass of N + 2 x atomic mass of O = 11 x 12.01 + 12 x 1.008 + 2 x 14.01 + 2 x 16.00 = 204.2 g/mol 5. Methionine has molecular formula: C5H11NO2S Molecular weight = 5 x atomic mass of C + 11 x atomic mass of H + 1 x atomic mass of N + 2 x atomic mass of O + 1 x atomic mass of S = 5 x 12.01 + 11 x 1.008 + 1 x 14.01 + 2 x 16.00 + 1 x 32.07 = 149.2 g/mol.