In chemistry, we often need to change between units like millimoles (mmol) and moles (mol). A mole is a huge amount of substance, containing 6.022 x 10^23 particles. A millimole, as the name implies, is simply one thousandth of a mole. To change millimoles to moles, more info we use a simple multiplier. Since there are 1000 millimoles in every mole