A sample of potato was ground in a ball mill to give a starch-like molecule of lower molecular weight. the product analysed 0.086% phosphorous if each molecule is assumed to contain one atom of phosphorous, what is the molecule weight of material

36000

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37000

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46000

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3600

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Solution

The correct option is A 36000
the percentage is given question is .86%.therefore
in 100 gm of the starch molecule will contain .86 gm of phosphorus
given 1atom of phosphorus is contained in one molecule.
therefore Na(avagadro no) of phosphorus will also contain Na molecule or 1mole which corresponds to molecular mass.
0.86 gm of phosphorus equal to 100 gm of a molecule
31 gm corresponds to $\frac{100 \times 31}{0.086}$ =36045gm
molecular weight is 36045 gm

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A sample of potato was ground in a ball mill to give a starch-like molecule of lower molecular weight. the product analysed 0.086% phosphorous if each molecule is assumed to contain one atom of phosphorous, what is the molecule weight of material​

A sample of potato was ground in a ball mill to give a starch-like molecule of lower molecular weight. the product analysed 0.086% phosphorous if each molecule is assumed to contain one atom of phosphorous, what is the molecule weight of material