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# moles and concentration Watch

1. how would i work out the concentration of a substance
2. no moles = mass /Mr

concentration = no moles / volume (in dm3)

remember, 1000cm3 = 1dm3
3. It would depend on the question.
4. moles/volume id dm^3
5. (Original post by hazbaz)
moles/volume id dm^3

moles/volume id dm^3 X 1000
6. no. moles*1000/volume
7. (Original post by Doink-the-Clown)
moles/volume id dm^3 X 1000
no.

concentration = moles/volume in dm3
OR
concentration = (moles/volume in cm3) x 1000

as volume in dm3 = volume in cm3 / 1000
8. (Original post by EierVonSatan)
It would depend on the question.
indeed, we are assuming you want concentration in moldm-3 rather than % w/v or ppm.
no.

concentration = moles/volume in dm3
OR
concentration = (moles/volume in cm3) x 1000

as volume in dm3 = volume in cm3 / 1000
I knew that-It was a commonsense that I didn't correct his dm^3 mistake.
10. (Original post by woodsy344)
how would i work out the concentration of a substance
n=cv

n/(v in dm^3)=c

n=mass of substance in g/RAM
11. (Original post by EierVonSatan)
It would depend on the question.
This.
no moles = mass /Mr

concentration = no moles / volume (in dm3)

remember, 1000cm3 = 1dm3
well said. This is probably how they are going to ask you in the exam

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