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MMoreno3K wrote:In an exam would we ever have to convert from mol to mmol or vice-versa?
From what I've seen in my chemistry career so far (Chem Honors and AP Chemistry), I have never seen any question ask for the moles of a molecule/atom as mmol. It is almost always simply in moles. However, if you were to convert from mol to mmol, multiply by (1000 mmol/1mol). To convert from mmol to mol, multiply by (1mol/1000mmol).
The conversion from mol to mmol is fairly trivial, you should be confident in doing that conversion! As has been said, 1mmol=1x10^-3mol. You should always be prepared to convert between units in chemistry. As Dr. Lavelle said, chemists like stuff like Angstroms sometimes, so it is within reason that you could be asked to do conversion between any order of magnitude. For example, if you find the liters of something, we could fairly ask you to convert that to picoliters if we wanted to (odd example, but the point stands).
An easy way to remember conversions is The Great King Henry Died By Drinking Chocolate Milk. Tera, Giga, Kilo, Hecto, Deca, Base, Deci, Centi, Milli. You can see that because milli is three away from the base to the right, a mmol is 10^-3 mol.
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