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The SI prefix "milli" represents a factor of 10-3, or in exponential notation, 1E-3.
So 1 millimole = 10-3 moles.
The definition of a mole is as follows:
The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is "mol."
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