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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 decapeptide `=796` g/mol
Total bonds to be hydrolysed `=(10-1)=9` per molecule
Total weight of `H_(2)O` added `=9xx18=162` g/mol
Total weight of hydrolysis product `=796+162=958 g`
Total weight % of glycine (given) `=47%`
Total weight of glycine in product `=(958xx47)/100 g=450 g`
Molecular weight of glycine `=75` g/mol
Number of glycine molecule `=450/75=6`.
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