An octapeptide (Mol. wt. = 516 g) on complete hydrolysis given glycine and alanine (Mol. mass = 89 g). Alanine contributes 41.59% to total weight of hydrolysed product. How many number of alanine unit present in octapeptide.
Text Solution
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Sol. Molecular weight of octapeptide is 516 g/mole.
Total bonds to be hydrolysed (8 – 1) = 7.
Total weight of H 2 O added = 7 × 18 = 126 gm/mole
Total weight of hydrolysed product = 126 + 516 = 642 gm.
Total weight of alanine in product = 
= 267 gm.
Molecular weight of alanine = 89 g/mole.
Number of alanine unit = 
= 3.
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