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askchemistry
Oct 11, 2007, 09:18 PM
If you diluted the 0.50 M(molarity) sample to a final volume of 250mL, what is the new concentration of the iron (II) bromide?

templelane
Oct 13, 2007, 01:24 PM
concentration = the amount of something per unit volume

Therefore the equation you want is
concentration (moles/litre) = amount(moles)/volume (litres)

Just remember to change your units from mL into litre and you'll be sorted.