IIT-JEE 2011 · Paper 1 · Chemistry Q23

← IIT-JEE 2011 · Paper 1

ChemistryInteger+4Question 23 of 69

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

Your answer

Answer and worked solution

Official answer: 6

Mass of products. Hydrolysis of a decapeptide adds 9 H₂O: $796+9(18)=958$ g per mole.

Glycine. $0.47\times958=450$ g, i.e. $\frac{450}{75}=6$ glycine units.

Answer: 6

Topics:Amino acids and proteins Stoichiometry

← Previous question Next question →

IIT-JEE 2011 · Paper 1, Chemistry question 23