A decapeptide (Mol. Wt. 796) on complete hydrolysis gives glycine ( Mol.wt.75), alanine and phenylalanine. Glycine contributes 47.0% to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is

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Detailed Solution

Molecular weight of decapeptide = 796 g/mol
Total bonds to be hydrolysed = (10 – 1) = 9 per molecule
Total weight of $H_{2} O$ added $= 9 \times 18 = 162 g / m o l$
Total weight of hydrolysis products $= 796 + 162 = 958 g$
Total weight % of glycine (given) = 47%
Total weight of glycine in product $= \frac{958 \times 47}{100} g = 450 g$
Molecular weight of glycine $= 75 g / m o l$
Number of glycine molecules $= \frac{450}{75} = 6$ .
Note: A dipeptide has one peptide bond. Thus, a decapeptide has 9 peptde bonds.