A sample of hydrolysed potato starch is found to contain 0.086% phosphorus. If each molecule is assumed to contain one atom of phosphorus, the molecular mass of hydrolysed potato starch is (at. Mass of phosphorus = 31 u).

Options

A. `8.6xx10^(3)`
B. `3.6xx10^(4)`
C. `8.6xx10^(4)`
D. None of these

Answer

B

Explanation

Phosphorus content = 0.086%
`=0.086xx10^(-2)=8.6xx10^(-4)`
One atom of phosphorus means minimum molecular mass
Min. molecular mass `=("At. Mass of P")/("Phosphorus content")`
`=(31.000u)/(8.6xx10^(-4))=3.6xx10^(4)`