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 hydrolyzed products. Find the number of glycine units present in the decapeptide.

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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 hydrolyzed products. Find the number of glycine units present in the decapeptide.

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Let there are n Glycine units in the compound because it is decapeptide hence 9 water molecule will be added during hydrolysis therefore total weight of the product will be

$796 + 9 \times 18 = 958$

% Wt. of glycine in the given weight of product

$= \frac{75 n}{958} \times 100 = 47$

$n = \frac{47 \times 958}{75 \times 100} = 6$

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