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chemistry moles help please ?

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aiyla:
Concentration of cholesterol C27H4O6 in a patients blood was found to be 6 millimole
a. find the concentration in mole/dm3
b. find the concentration in grams/dm3
c. what is the mass of cholesterol in 10cm3 of the patients blood .


please if some one can answer this ,, its not much .. cud u like show what formula;s you used ?

@d!_†oX!©:

--- Quote from: aiyla on October 25, 2009, 03:59:35 pm ---Concentration of cholesterol C27H4O6 in a patients blood was found to be 6 millimole
a. find the concentration in mole/dm3
b. find the concentration in grams/dm3
c. what is the mass of cholesterol in 10cm3 of the patients blood .


please if some one can answer this ,, its not much .. cud u like show what formula;s you used ?

--- End quote ---
can u check the question plss
i think the question should be 6 millimole per dm^3 (or litre or cm^3 cuz d concentration cannot be just 6 millimoles)
check the question and let me know

nid404:
Is it 6 millimolar ???

aiyla:
yes its 6 millimole per dm^3

nid404:
I assume it is millimolar.
So u get millimolar=10-3 molar
1 molar= 1mol/l
1l=1dm3
therefore
 a)6 millimolar= 0.006 molar or mol/dm3
b)1 mole= 27X12 + 4 + 6X16=424g
therefore 0.006moles/dm3 = 0.006X424g/dm3
c)conc is 0.006mol/dm3. volume=10cm3 which is 0.01dm3
conc=mole/vol
moles=concXvol
so no of moles of cholestrol in 0.01dm3 are 6X10^-5

hope this helps :)
therefore mass is 6X10^-5 X 424

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