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JEE Advanced levelNumerical answerDifficulty 3 of 3bm110

A linear homopolypeptide made only of glycine has molar mass 5718 g/mol. Taking molar masses of glycine = 75 g/mol and water = 18 g/mol, the number of peptide bonds in one molecule is (nearest integer)

Numerical answer type, tolerance 0.5.

Answer: 99

A chain of

n

glycine residues forms by losing

n - 1

water molecules:

M = 75 n - 18 (n - 1) = 57 n + 18

. So

57 n + 18 = 5718

gives

n = 100

. Number of peptide bonds =

n - 1 = 99

.

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