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

    concentration = no moles / volume (in dm3)

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

    moles/volume id dm^3 X 1000
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    no. moles*1000/volume
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    (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
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    (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.
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    (Original post by gingerbreadman85)
    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.
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    (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
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    (Original post by EierVonSatan)
    It would depend on the question.
    This.
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    (Original post by gingerbreadman85)
    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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