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  • Calculate the minimum molecular weight of starch if some amount of potato starch was converted to starch like molecule having lower molecular weight wing a ball mill if the product analysed <img al

Calculate the minimum molecular weight of starch if some amount of potato starch was converted to starch like molecule having lower molecular weight wing a ball mill if the product analysed \mathrm{0.079 \% \, P} (atomic weights of \mathrm{P=31} )

Option: 1

\mathrm{392 \times 10^4 \mathrm{~g}}


Option: 2

\mathrm{392 \mathrm{~g}}


Option: 3

\mathrm{3.92 \times 10^4 \mathrm{~g}}


Option: 4

\mathrm{39.2 \times 10^4 \mathrm{~g}}


Answers (1)

best_answer

In one molecule of starch minimum one P atom must be present.

\mathrm{0.079 \mathrm{~g}} of \mathrm{ p} present in \mathrm{100 \mathrm{~g}} of starch

\mathrm{ \begin{aligned} 31 \mathrm{~g} \text { of p present } \dot{m} & =\frac{100}{0.079} \times 31 \\ & =39240.50 \mathrm{~g} \end{aligned} }
\therefore  minimum molecular wright of starch \mathrm{=3.92 \times 10^4 \mathrm{~g}}

Posted by

Divya Prakash Singh

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