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A decapeptide (Mol. Wt. 769) on complete...

A decapeptide (Mol. Wt. 769) 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.

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The correct Answer is:
6
Molecular weight of decapapetide `=769 g//mol`
Total bonds to be hydrolysed `=(10-1)=9` per molecule
Total weight of `H_(2)O` added `= 9 xx 18 = 162` g/mol
Total weight of hydrolysis product `= 769 +162 = 958 h`
Total weight `%` of glycine (given) `= 47 %`
Total weight of glycine in product `= (958 xx 47)/(100) g = 450 g`
Molecular weight of glycine `= 75 g//mol`
Number of glycine molecule `= (450)/(75) =6`.
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