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Amino Acids

A decapeptide...

Question

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 ___.
(IIT-JEE, 2011)

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Solution

Total wt. of amino acids after addition of 9 mole of $H_{2} O$ = 796 + 9 $\times$ 18 = 958
Now 47% is glycine, then total mass of glycine = 958 $\times$ 0.47 = 450
Therefore, no. of glycine molecules = $\frac{450}{75} = 6$

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(IIT-JEE, 2011)

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