concentration question - (Mar/12/2007 )

How to calculate concentration from formula weight and density.

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It is impossible because as so each substance with equal mol weigt will have the same concentration and what's about density which is unique property for any compound????



I think it is not enough, you need mol number in your define solution volume to transform Mw to gram

Then %= (mol*Mw)/(density*Volume)*100

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I mean I have chemicals in solution form from supplier. Its molecular weight i hope F.G=99.16 and density =1.013 is given i want to know its concentation from these two values.

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is it a solution or a liquid chemical?

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Its a liquid chemical

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okay.

the density is 1.013 which means that it is 1.013g/ml or 1013g/liter. with a formula weight of 99.16 g/mole the concentration is 1013/99.16 = 10.216 moles/liter (assuming 100% purity).

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If you want to learn the molarity of the original bottle of the compound, you can use this formula:

Molarity of the original bottle (M)= (% of the compound X d (g/mL) X 1000) / molecular weight (g/mol)

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