Chemistry Help Needed

[satty2007]

How would you convert 0.0775mol dm3 to mg/ml, ive been tryng to figure it out but i keep getting confused as im not good with numbers.

could some one good at chemistry please help me out?

[Nehmat]

0.0775mol dm3 OF what?! compound/element?!

[satty2007]

0.0775mol dm3 OF what?! compound/element?!

its a solution of aspirin 0.6983g in 50ml of methanol, the concentration for that is 0.0775 and i need to conver that to mg/ml

[Nehmat]

.

[Nehmat]

Here's a conversion if it'll help:

1M = 1mol.dm3

[Gurmat Sangeet]

concentration = No. Moles/Volume

you have 0.0006983mg of asprin dissolved in 50ml of methanol

No. of Moles = Actual Mass/ Mr

your actual mass is 0.0006983 divide that by the Mr of Asprin which must also be converted into milligrams as the standard of Mr is grams, do that by dividing it by 1000

That will give you the No. of moles

divide that value by your volume which is 50ml

and you should have your concentration in mg/ml

[satty2007]

concentration = No. Moles/Volume

you have 0.0006983mg of asprin dissolved in 50ml of methanol

No. of Moles = Actual Mass/ Mr

your actual mass is 0.0006983 divide that by the Mr of Asprin which must also be converted into milligrams as the standard of Mr is grams, do that by dividing it by 1000

That will give you the No. of moles

divide that value by your volume which is 50ml

and you should have your concentration in mg/ml

if im not wrong to convert g to mg you mulitiply by 1000 and not divide which what i think you've done

[Nehmat]

try using this site:

Chemistry Forum

[Gurmat Sangeet]

concentration = No. Moles/Volume

you have 0.0006983mg of asprin dissolved in 50ml of methanol

No. of Moles = Actual Mass/ Mr

your actual mass is 0.0006983 divide that by the Mr of Asprin which must also be converted into milligrams as the standard of Mr is grams, do that by dividing it by 1000

That will give you the No. of moles

divide that value by your volume which is 50ml

and you should have your concentration in mg/ml

if im not wrong to convert g to mg you mulitiply by 1000 and not divide which what i think you've done

ye sorry times by 1000

did it work?

if not just try going along the lines of those equations u shud reach ur answer, and google the assumptions your allowed to make etc etc

[Guest Guest]

your given the concentration in g/ml so wouldnt you just multiply 0.6983 by 1000 so you have 6983mg in 50ml, then divide 6983 by 50 to get 139.66mg per ml?