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What is the total volume of your solutions? How much KI do you have initially?

At a simple level, yes, the volume is additive.So how are the concentration and volume related, for a given amount of substance?

OK, If you have 1.00 mol dm^{-3}, how many moles in 5.0 cm^{-3}?

No, not 5 mol. How many cm^{3} in 1 dm^{3} ?

OK, so if there are 1000 cm^{3} in 1 dm^{3}, and you have 0.1 mol in 1 dm^{3}, how many moles in 1000 cm^{3}? In 5 cm^{3}?