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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$Decapeptide \to_{water}^{9 molecule} (x) glycine + (y) alanine + (z) phenylalanine$

Mass of hydrolysed product = 796 + 18 × 9

mass of glycine = $958 \times \frac{47}{100} = 450.26$

No. of glycine unit = $\frac{450.26}{75} = 6$

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