Q.

A dodecapeptide made of molecular weight 980, on complete hydrolysis gives alanine (Molecular weight 89) as one of the products. If the alanine makes up 52.9 % by weight of the hydrolysis products, how many alanine units are there in the dodecapeptide?

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answer is 7.

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Detailed Solution

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A dodecapeptide is made up of 12 amino acid units. On hydrolysis they take up 12 moles of water. 89×x980+11×18×100=52.9x=7

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